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Western Shawnee County

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Stratigraphic Sections

Each geologic formation or member that crops out in western Shawnee County and vicinity, except the Johnson Shale, is represented, at least in part, starting with the oldest, in one or more of the measured sections that follow. Many additional sections were measured for this study. Only partial sections of the Severy, Scranton, and Pillsbury Shales are included. H. D. Wagner measured sections in the Dover quadrangle. Some of these sections were later slightly modified by W. D. Johnson, Jr. The rest of the sections were measured by Johnson, usually assisted by W. L. Adkison. Lists of fossils in the U.S. Geological Survey Permian and Carboniferous fossil collection (for example, 19465-PC), noted in the measured sections, are shown in the text under the proper stratigraphic unit. Fusulinids retained in the U.S. Geological Survey foraminiferal collection are noted also (for example, f12962); however, these fossils had not been identified at the time of preparation of this report. Fossil identifications that are not credited are those made by the authors in the field.

1. Howard Limestone and the uppermost part of the Severy Shale

[In streambank and bed of Sixmile Creek: in the NE SW and SE NW sec. 16, T. 13 S., R. 15 E., Shawnee County]

Howard Limestone: feet
Utopia Limestone Member:  
Limestone, light-olive-gray, very finely crystalline, silty, thin-bedded; weathers dark yellowish orange to light grayish yellow and forms prominent ledge in stream bottom; upper 0.9 ft weathers to conspicuous oval concretionary masses, some as much as 2-3 ft long and 0.3 ft thick; abundant fusulinlds; many fenestrate and ramose bryozoans, and Composita, Reticulatia, and other brachiopods, particularly in lower 0.7 ft; varied thickness along stream 1.0-2.8
Limestone, light-gray (with brown hue), silty, very thin to thin-bedded; weathers to light-gray rubbly wavy beds and forms ledge; abundant fossil fragments, including small high-spired gastropods and ostracodes; thickness varies along stream 0.6-1.3
Thickness of Utopia Limestone Member 2.3-3.4
Winzeler Shale Member:  
Siltstone, dark-gray, finely laminated; weathers to medium-dark-gray very fissile pieces; abundant ostracodes; varied thickness along stream 0.6-1.4
Total combined thickness of Utopia Limestone and Winzeler Shale Members 3.7-4.0
Church Limestone Member:  
Limestone, medium-light-gray to medium-gray, very fine grained, slightly silty, thin- to thick-bedded, very hard; weathers light olive gray, in places mottled by pale yellowish orange; forms minor ledge that in part shows thin wavy bedding; locally contains hard algal (?) nodules as much as 0.15 ft long; abundant Cryptozoon-like algae, crinoid stems, horn corals, brachiopods, including specimens of Reticulatia, and productoid spines; fusulinids abundant in places, sparse or absent elsewhere; abrupt changes in thickness largely compensated for by changes in underlying Aarde Shale Member 0.3-1.3
Aarde Shale Member:  
Siltstone, light-olive-gray, laminated, carbonaceous; interbedded with medium-dark-gray to grayish-black carbonaceous slltstone that weathers to fissile plates; lenses, generally 0.1 ft thick and 0.2 ft long (some as much as 0.5 ft long), of light-brownish-gray very calcareous fossiliferous siltstone; siltstone grades laterally into medium-light-gray to light-olive-gray very silty laminated to platy fossilliferous limestone containing medium-dark-gray siltstone laminae. A siltstone 0.2 ft thick separates this limestone from overlying limestone unit, and in places this siltstone grades into olive-gray argillaceous platy calcareous sparsely carbonaceous sandstone. Weathered outcrop is streaked light olive gray and grayish black. Abundant crinoid stems and brachiopod fragments 0.3-1.0
Claystone and coal (Nodaway coal); grayish-black to black finely laminated very carbonaceous claystone containing partings as much as 0.03 ft thick of black hard brittle vitreous coal in upper half; claystone weathers grayish black, has much brownish-black iron stain and contains abundant secondary gypsum; lenses as much as 0.1 to 0.2 ft thick and 1 ft long of medium-gray to brownish-gray very argillaceous limestone in middle part; limestone lenses weather brownish gray, are iron stained, and contain very abundant crinoid stems, bryozoans, and brachiopods .4
Thickness of Aarde Shale Member 0.7-1.4
Thickness of Howard Limestone 5.4-6.0
Severy Shale:  
Claystone, medium-dark-gray to grayish-black, silty, laminated; weathers medium dark gray to brownish gray; much dark-brown iron stain. Lenses as much as 0.25 ft thick and 1 ft long of medium-dark-gray very silty laminated very fossiliferous limestone form discontinuous bed at top of unit. Upper contact gradational; abundant crinoid stems, bryozoans, and brachiopod fragments 0.9
Claystone, light-olive-gray, very silty, laminated to platy; weathers light olive gray to light yellowish gray; much light-yellowish-brown iron stain; some plant fragments; basal contact below creek level 4.7
Thickness of exposed Severy Shale 5.6

2. Howard Limestone

[Along tributary of the Wakarusa River In the NW SW sec. 33 and on the east line of the SE sec. 32, T. 13 S., R. 15 E., Shawnee County]

Howard Limestone: feet
Utopia Limestone Member:  
Limestone, medium-light-gray to medium-gray, finely crystalline, very thin bedded; weathers light gray; upper 1.7 ft contains abundant fusulinids; next lower 0.1 ft is coquinoidal limestone of Osagia, ramose and fenestrate bryozoans, Composita, Meekella, and other brachiopods, pelecypods, and gastropods; limestone in lower 0.3 ft composed mainly of Osagia; basal 0.1 ft gradational into underlying unit 2.5
Siltstone, dark-gray, finely laminated; weathers to light-gray hard fissile fragments; abundant ostracodes 2.0
Limestone; medium gray with brown hue, generally finely to medium crystalline; parts coarsely crystalline; very thin bedded, partly coqulnoidal; very thin beds of light-olive-gray to olive-gray slightly sandy finely laminated claystone, particularly in lower 2.5 ft; limestone weathers to irregular yellowish-gray to light-olive-gray beds; large dark-yellowish-orange patches on upper surfaces; large fragments of cone-in-cone calcite; very abundant fenestrate and ramose bryozoans; abundant Osagia, crinoid stems, echinoid spines, Neospirifer, Juresania, and other brachiopods, Myalina, Orthomyalina, and other pelecypods, gastropods; conspicuous amphibian tracks locally 7.3
Thickness of Utopia Limestone Member 11.8
Winzeler Shale Member:  
Claystone, light-olive-gray to light-olive-brown, silty 0.6
Siltstone, sandy; weathers moderate yellowish brown .4
Sandstone, very fine grained, calcareous; weathera moderate yellowish brown; nodules less than 0.3 ft thick of medium-gray medium-crystalline limestone .9
Limestone, medium gray with brown hue, finely crystalline, hard, hackly; lenticular nodular beds ; weathers yellowish gray to light gray; upper contact irregular, basal contact gradational; sparse crinoids, Juresania, Composita, and other brachiopods; forms ledge 1.8-2.2
Limestone, yellowish-gray to light-olive-gray, finely crystalline, silty, very thin bedded; weathers yellowish gray; irregular beds of hard nodules generally less than 0.4 ft thick and as much as 1.5 ft long of finely to medium-crystalline limestone that is medium gray with brown hue; nodules are more resistant than matrix; a few crinoids, Composita, and other brachiopods; forms reentrant in outcrop 2.1
Thickness of Winzeler Shale Member 5.8-6.2
Church Limestone Member:  
Limestone, light-olive-gray to light-brownish-gray, medium-crystalline, partly silty, hard; generally weathers to single moderate-yellowish-brown ledge; abundant Juresania, Composita, Hustedia, and other spiriferoid brachiopods; also Chonetes and Marginifera; many Osagia and crinoid stems; a few gastropods and horn corals 2.2
Aarde Shale Member:  
Siltstone, light-olive-gray, sandy, finely laminated; shell fragments and crinoid stems 2.5
Coal (Nodaway); base concealed .7+
Thickness of exposed Aarde Shale Member 3.2
Thickness of exposed Howard Limestone 23.0-23.4

3. Soldier Creek Shale Member of the Bern Limestone down into the upper part of the White Cloud Shale Member of the Scranton Shale

[In streambank and along farm road In the NW NE sec. 1, T. 14 S., R. 14 E., Osage County (south of mapped area)]

Bern Limestone: feet
Soldier Creek Shale Member:  
Limestone, light-gray to medium-light-gray streaked with brownish-gray, finely crystalline, hard; weathers light yellowish brown; abundant pelecypods; upper contact concealed 3.7+
Burlingame Limestone Member:  
Limestone, very light brownish gray, finely crystalline, very thin bedded; weathers to thin rounded moderate-yellowish-brown plates; dark-yellowish-orange patches on upper surface of some plates; many dark-yellowish-orange ferruginous spots; fusulinids, Cryptozoon-like algae, Osagia, crinoids, ramose bryozoans, and brachiopods 3.1
Thickness of exposed Bern Limestone 6.8
Scranton Shale:  
Silver Lake Shale Member:  
Partly covered Interval; grayish-olive slightly sandy claystone; scattered nodules less than 0.1 ft thick just below top 5.0
Claystone, light-olive-gray to light-olive-brown, slightly silty; weathers yellowish gray mottled with pale grayish orange; many thin beds of medium-light-gray, and some brownish-gray finely crystalline sandy micaceous limestone in upper 10 ft; limestone weathers mottled yellowish gray and light brown; many ramose bryozoans, brachiopods, and pelecypods (mainly Myalina) 23.4
Thickness of Silver Lake Shale Member 28.4
Rulo Limestone Member:  
Limestone, medlum-light-gray, finely crystalline; weathers light gray to yellowish gray; crinoid stems, bryozoans, and brachiopods; partly covered 1.2
Cedar Vale Shale Member:  
Coal (Elmo), intensely weathered 0.3
Clay, pale-olive to light-olive-gray, slightly sandy; carbonaceous streaks .5
Sandstone, yellowish-gray (with brown hue), fine-grained, soft; silty in basal 1 ft; weathers yellow gray; some hard crossbedded lenses at top 12.5
Limestone, silty; weathers pale yellowish orange 1.4
Claystone, dusky-yellow, silty; weathers pale olive 7.8
Sandstone, pale-olive, silty, soft; weathers yellowish gray; hard yellowish-gray calcareous thin-bedded sandstone interbeds containing some crossbedded lenses as much as 0.7 ft thick; some ferruginous micaceous sandstone nodules that weather dark yellowish orange to light brown; forms resistant bed 3.0
Thickness of Cedar Vale Shale Member 25.5
Happy Hollow Limestone Member:  
Limestone, greenish-gray, finely crystalline, thin-bedded, sandy, ferruginous, hard, compact; weathers to mottled dark-yellowish-orange, moderate-yellowish-brown, and light-brown knobby beds; abundant fenestrate and ramose bryozoans, brachiopods (Meekella?, Derbyia, Reticulatia), and low-spired gastropods 1.4
White Cloud Shale Member:  
Siltstone, medium-dark-gray, slightly sandy, laminated weathers pale olive, grayish olive and medium light gray brown iron stains on bedding planes; carbonaceous material upper contact irregular 6.7
Coal, black, hard, brittle .4
Thickness of exposed White Cloud Shale Member 7.1
Thickness of exposed Scranton Shale 63.6

4. Tarkio Limestone Member of the Zeanaale Limestone down to the tase of the Bern Limestone

[In quarry in the SE SW sec. 3, and along adjacent road on the south line of the SW sec. S, T. 12 S., R. 14 E., Shawnee County]

Zeandale Limestone: feet
Tarkio Limestone Member:  
Limestone, brownish-gray, very fine grained, slightly argillaceous, medium-bedded; weathers to moderate-yellowish-brown trapezoidal blocks; abundant large fusulinids, crinoid stems, and bryozoans; a few brachiopods; only lower part exposed 2.8+
Willard Shale:  
Claystone (deeply weathered), olive-gray to moderate-yellowish-brown 0.4
Sandstone, medium-gray to olive-gray, very fine grained, very silty, platy, micaceous; weathers light olive gray to pale yellowish brown .9
Siltstone, clayey, micaceous; weathers olive gray; many hard ferruginous siltstone layers less than 0.02 ft thick that weather moderate yellowish brown and form small hard fragments 26.0
Claystone (deeply weathered), olive-gray; olive-gray limestone pellets less than 0.05 ft in diameter; upper contact gradational; poorly exposed 10.2
Covered interval 1.4
Thickness of Willard Shale 38.9
Emporia Limestone:  
Elmont Limestone Member:  
Limestone, medium-dark-gray, very fine grained; weathers to pale-yellowish-brown and olive-gray cobbles; brown fossil fragments; many fusulinids, crinoid stems, and bryozoans; partly exposed; basal contact covered 0.6+
Lower part of Elmont Limestone Member and upper part of Harveyville Shale Member:  
Covered interval 5.8
Harveyville Shale Member:  
Siltstone, olive-gray, clayey, laminated to platy; irregular plates about 0.05 ft thick and as much as 0.4 ft long of medium-light-gray very fine grained argillaceous limestone in upper 3.8 ft; moderate-yellowish-brown iron stain on bedding planes in lower 3.2 ft; lower contact sharp, even 8.6
Reading Limestone Member:  
Limestone, medium-gray, very fine grained; moderately argillaceous in upper 0.45 ft and lower 0.2 ft; thin to medium bedded; weathers mottled pale to moderate yellowish brown and olive gray; darker bed in upper 0.45 ft forms step back into outcrop face; some light-red barite inclusions; basal contact irregular, slightly gradational; abundant fusulinids, crinoid stems, bryozoans, and brachiopods; some small gastropods 2.7
Thickness of exposed Emporia Limestone 17.7
Auburn Shale:  
Siltstone, medium-dark-gray, clayey, laminated; weathers olive gray; sparse brachiopods and pelecypods 5.8
Limestone, medium-gray, very fine grained, argillaceous; weathers olive gray; crinoid stems, brachiopod-shell fragments, productoid spines, bryozoans .5
Claystone, olive-gray, silty, calcareous; abundant crinoid stems, bryozoans, Reticulatia, Neospirifer, Chonetes, Derbyia, Composita, and productoid spines .5
Limestone, medium-gray, very fine grained, very argillaceous; bedding Indistinct; weathers olive gray; crinoid stems, bryozoans, Chonetes and other brachiopods, and productoid spines .5
Claystone, olive-gray, silty, calcareous, platy .2
Claystone, olive-gray, silty, calcareous, platy; a few fossiliferous limestone beds less than 0.02 ft thick; abundant small fossil fragments .5
Limestone, medium-gray to olive-gray, very fine grained, argillaceous; abundant crinoid stems, bryozoans, and shell fragments .1
Claystone, olive-gray, silty, calcareous, platy; shell fragments .2
Limestone, medium-gray to olive-gray, very fine grained, argillaceous, thin-bedded; abundant crinoid stems, bryozoans, shell fragments (including Chonetes and Derbyia}, productoid spines, and pelecypods .6
Limestone and claystone, interbedded; limestone, in beds 0.02-0.05 ft thick, is medium gray, very fine grained, and argillaceous, and weathers olive gray to moderate yellowish brown. Claystone, in beds as much as 0.02 ft thick is medium gray to olive gray and calcareous; abundant very fine shell hash in all beds .8
Claystone, dark-gray, silty, calcareous, platy to very thin bedded; weathers medium dark gray; a few pyrite crystals 2.3
Limestone, light-gray, very fine grained, very argillaceous, thin- to medium-bedded; many light-brownish-gray and greenish-gray claystone partings; subconchoidal fracturing, mud cracks, and scattered clusters of pyrite in upper two-thirds; lower one-third contains some less resistant beds as much as 0.15 ft thick of mottled light-olive-gray and medium-dark-gray very argillaceous limestone 6.7
Limestone, medium-gray, very clayey to silty; weathers medium light gray; scattered small dark inclusions .2
Limestone, light-olive-gray to light-olive-brown, very fine grained, very argillaceous, thin- to medium-bedded; some greenish-gray clayey siltstone pellets as much as 0.04 ft thick and pale-yellowish-brown argillaceous limestone pellets as much as 0.02 ft in diameter; unit weathers pale yellowish brown; upper 0.6 ft forms separate ledge in places 3.3
Claystone; medium dark gray in lower part to olive gray in upper part; silty, slightly calcareous; light-olive-gray very argillaceous nodular limestone beds as much as 0.13 ft thick in upper 10.5 ft; some light-red calcite crystals in limestone; basal contact sharp; sparse small fossil fragments in claystone 13.8
Thickness of Auburn Shale 36.0
Bern Limestone:  
Wakarusa Limestone Member:  
Limestone, grayish-brown, very fine grained, slightly silty, hard; weathers light olive gray to light gray; abundant fusulinids (especially in upper part) Cryptozoon-like algae, and crinoid stems 2.8
Claystone, dark-olive-gray to medium-dark-gray, silty, laminated; small brachiopods .3
Limestone, dark-olive-gray, very argillaceous; abundant small shell fragments and crinoid stems .1
Claystone; dark gray to grayish black and very calcareous in lower half; dark olive gray in upper half; abundant shell hash 0.1
Limestone, medium-gray, very fine grained; very argillaceous in lower 0.2 ft; single bed; abundant shell hash, crinoid stems, and small gastropods .7
Thickness of Wakarusa Limestone Member 4.0
Soldier Creek Shale Member:  
Claystone, dark-greenish-gray, silty, slightly calcareous; platy in upper 0.2 ft; weathers light greenish gray 1.5-1.8
Limestone, light-gray, very fine grained; particularly argillaceous in upper part; Irregular laminae and patches of light-greenish-gray calcareous claystone; upper contact gradational 1.4-1.6
Limestone and claystone, interbedded; limestone, generally in beds 0.2-0.32 ft thick, is light gray to light olive gray, very fine grained, and very argillaceous and weathers light yellowish gray to light yellowish brown and has subconchoidal fracture; claystone, in beds 0.01-0.05 ft thick, is greenish gray, very silty, and calcareous 3.0
Claystone, light-greenish-gray, silty, laminated; weathers to small smooth rounded blocks .7
Thickness of Soldier Creek Shale Member 6.6-7.1
Burlingame Limestone Member:  
Limestone, medium-light-gray, very fine grained, argillaceous, medium- to thick-bedded; brecciated in upper 4 ft; pyritic; upper contact irregular; sparse crinoid stems, brachiopods (including Neospirifer), and small gastropods in upper 4 ft; abundant fusulinids, Osagia, crinoid stems, brachiopods, and gastropods in lower 0.8 ft 4.8
Claystone, yellowish-gray, silty, calcareous; weathers grayish orange .2
Limestone, pale-yellowish-brown, very fine grained, hard, conglomeratic; weathers to single pale-yellowish-brown bed; lower contact sharp, uneven; abundant Osagia, pelecypods, and gastropods, especially in the upper part 1.9
Thickness of Burlingame Limestone Member 6.9
Thickness of Bern Limestone 17.5-18.0

5. Basal part of the Willard Shale down to the top of the Bern Limestone

[Along farm-access road and along U.S. Highway 40 In the SW NE sec. 35, T. 11 S., R. 14 E., Shawnee County]

Willard Shale: feet
Claystone, calcareous, partly very fossiliferous; weathers olive gray; abundant Composita, Hustedia, Chonetes, and other brachiopods in lower 0.6 ft; upper part not exposed 2.0+
Emporia Limestone:  
Elmont Limestone Member:  
Limestone, brownish-gray, very fine grained; argillaceous in upper 0.2 ft; weathers to single olive-gray to moderate-yellowish-brown bed; platy fragments in upper 0.2 ft; brownish-gray fossil fragments ; abundant fusulinids and brachiopod fragments 0.9
Claystone, medium-gray, calcareous; weathers olive gray; abundant fossil fragments .4
Limestone, brownish-gray, very fine grained, thin- to thick-bedded; weathers olive gray to moderate yellowish brown; some small vugs filled with moderate-pink barite; abundant brachiopods, including Composita 2.8
Thickness of Elmont Limestone Member 4.1
Harveyville Shale Member:  
Claystone, medium-dark-gray, silty; interbedded with medium-dark-gray siltstone laminae; unit weathers olive gray 12.5
Reading Limestone Member:  
Limestone, medium-gray, moderately argillaceous; weathers to moderate-yellowish-brown bed; forms step back into outcrop face; crinoid stems and braciopods 0.5
Limestone, medium-gray, very fine grained, hard; weathers moderate yellowish brown; forms ledge; some vugs filled with moderate-pink barite; abundant fusulinids, crinoid stems, and brachiopods 1.7
Limestone, very argillaceous; weathers moderate yellowish brown; forms reentrant between limestone layers .1
Limestone, medium-gray, very fine grained; weathers moderate yellowish brown; small fossil fragments .6
Thickness of Reading Limestone Member 2.9
Thickness of Emporia Limestone 19.5
Auburn Shale:  
Claystone, medium-dark-gray, platy; weathers light olive gray; argillaceous limestone bed 0.5 ft thick that weathers light olive brown to grayish yellow about 1 ft below top; abundant Chonetes, Neospirifer, and other brachiopods in upper 1 ft; some gastropods and fenestrate bryozoans 6.0
Limestone, medium-dark-gray, very fine grained, hard, compact; some thin calcareous claystone partings; upper contact irregular; crinoid stems and Chonetes, Neospirifer, and other brachiopods; some pelecypods and gastropods 1.3
Claystone, very calcareous; weathers olive gray to yellowish brown; abundant crinoid stems, brachiopods (including Chonetes), and pelecypods .1
Limestone, medium-dark-gray, medium-grained, coquinoldal; weathers brownish gray; abundant small claystone pellets; upper surface wavy; abundant peleeypods (mainly Myalina) 3.8
Claystone, dark-gray, laminated to platy; weathers olive gray to olive brown; upper contact sharp; abundant Lingula 1.0
Claystone, dark-gray to grayish-black; weathers light olive brown; very carbonaceous in lower 0.2 ft; abundant Lingula 1.2
Claystone, light-olive-gray .4
Claystone, very sllty, very calcareous; weathers grayish yellow; scattered concretiona as much as 0.6 ft thick and 0.8 ft long of dark-gray very fine grained argillaceous hard compact limestone at base 3.3
Claystone, medium-gray; weathers olive gray; outcrop crossed by joints as much as 0.2 ft wide filled with medium-gray very argillaceous limestone 2.2
Claystone, medium-gray, slightly silty; weathers mottled light olive gray and light olive brown; abundant light-yellowish-gray limestone pellets less than 0.02 ft in diameter 2.2
Covered interval; probably claystone 6.8
Claystone, medium-gray, slightly silty; weathers mottled light olive gray and light olive brown; abundant light-yellowish-gray limestone pellets less than 0.02 ft in diameter 17.0
Thickness of Auburn Shale 45.2
Bern Limestone:  
Wakarusa Limestone Member: (not described) 2.4+

6. Basal part of the Pillsbury Shale down, into the upper part of the Willard Shale

[Along U.S. Highway 40 In the NW NW sec. 32, T. 11 S., R. 14 E., Shawnee County]

Pillsbury Shale: feet
Claystone; weathers light olive gray; abundant irregular light-gray argillaceous limestone nodules less than 0.04 ft thick and 0.07 ft long; upper contact not exposed 2.0+
Zeandale Limestone:  
Maple Hill Limestone Member:  
Limestone, medium-gray to medium-dark-gray, very finely crystalline, argillaceous in lower 0.13 ft; weathers moderate yellowish brown; weathered deep into rock; upper surface irregular, much mottled by iron stain; forms single bed; very thin bedded in basal part; abundant small fusulinids, crinoid stems, bryozoans, and brachiopods 2.0
Wamego Shale Member;  
Claystone, olive-gray to medium-gray, platy; many moderate yellowish-brown laminated to platy ferruginous siltstone beds less than 0.02 ft thick; Lingula, and pectinoid pelecypods 6.2
Claystone, very calcareous, moderately hard; weathers moderate yellowish brown; abnudant crinoid stems and pelecypods .4
Claystone, olive-gray, silty; shell fragments .2
Limestone, brownish-gray, very fine grained, very argillaceous, very thin bedded; very small argillaceous limestone pellets; abundant crinoid stems, productoid(?) spines, and pelecypods .4
Claystone, olive-gray, sllty, fossiliferous; light-olive-gray micaceous siltstone laminae; moderate-yellowish-brown argillaceous fossiliferous limestone nodules and lenses 1.8
Thickness of Wamego Shale Member 9.0
Tarkio Limestone Member:  
Limestone, light-olive-gray, very fine grained; weathers pale yellowish brown; weathers to small rubbly fragments in upper 0.4 ft; forms ledge in lower 1 ft; lower contact sharp; abundant foraminifers (including some fusulinids) and Osagia; fragments of brachiopods, pelecypods, and gastropods 1.5
Limestone, very fine grained; single bed; weathers to moderate-yellowish-brown irregular elongate blocks; many large vugs in upper 0.4 ft; light-red barite in some vugs; abundant large fusulinds and crinoid stems 5.9
Thickness of Tarkio Limestone Member 7.4
Thickness of Zeandale Limestone 18.4
Willard Shale:  
Siltstone, olive-gray, clayey to very finely sandy, micaceous; weathers light olive gray mottled with moderate yellowish brown and grayish red 1.3
Sandstone, light-olive-gray, very fine grained, silty, platy, micaceous ; weathers light yellowish gray; upper contact gradational .7
Siltstone, claystone, and sandstone, interbedded; siltstone very finely sandy; claystone silty; sandstone silty and very fine grained. Entire unit is olive gray, laminated to platy, and micaceous and weathers light olive gray, except for a few siltstone beds that weather moderate yellowish brown 2.8
Sandstone, light-olive-gray, very fine grained, silty, laminated to platy, very micaceous; weathers light yellowish gray to pale yellowish brown; lower contact gradational 1.3
Siltstone and sandstone, interbedded; siltstone light-olive-gray and clayey; sandstone very fine grained; some siltstone layers weather moderate yellowish brown .7
Sandstone, light-olive-gray, very fine grained, silty, laminated to platy, very micaceous; weathers light yellowish gray to pale yellowish brown .7
Claystone, medium-gray, silty; weathers light olive gray; many moderate-yellowish-brown ferruginous micaceous siltstone beds less than 0.04 ft thick that weather to hard chips; upper contact gradational; basal contact not exposed 6.0+
Thickness of exposed Willard Shale 13.5+

7. Aspinwall Limestone Member of the Onaga Shale down into the upper part of the Pillsbury Shale

[Along streams and in the hillside in the SW NW, NW SE, and SW NE, sec. 6, T. 13 S., R. 14 E., Shawnee County]

Onaga Shale: feet
Aspinwall (?) Limestone Member:  
Limestone, silty; weathers to large mottled light-yellowish-gray to light-brownish-gray blocks having irregular upper surfaces; many clayey limestone inclusions as much as 0.07 ft long that weather light yellowish gray to light yellowish brown; scattered barite inclusions; shell fragments (mainly pelecypods); poorly exposed 0.5
Towle Shale Member:  
Covered interval 7.5
Thickness of exposed Onaga Shale 8.0
Wood Siding Formation:  
Brownville Limestone Member:  
Limestone, very fine grained, argillaceous; weathers mottled light olive gray and olive brown; abundant fusulinlds and Marginifera 1.0
Pony Creek Shale Member:  
Covered interval 5.0
Grayhorse Limestone Member:  
Limestone, very fine grained, argillaceous, thin-bedded; weathers to large light-olive-gray to light-olive-brown rectangular pitted blocks having irregular upper surfaces ; abundant subrounded argillaceous limestone inclusions 0.01-0.1 ft long; abundant crinoid stems and minute fragments of shells (including those of pelecypods) 1.9
Plumb Shale Member:  
Covered interval; probably siltstone 6.2
Siltstone, olive-gray, silty, laminated to platy; abundant hard micaceous siltstone layers that weather yellowish brown; medium-dark-gray very argillaceous platy limestone lens as much as 0.4 ft thick locally at base; moderate-brown claystone bed 0.07 ft thick locally overlies limestone; coal bed 0.02 ft thick overlies claystone. The coal apparently merges laterally with underlying coal bed. Crinoid stems, bryozoans, Derbyia, Chonetes, Composita, Orthomyalina, and Myalina present in limestone bed 6.0
Coal; deeply weathered .7
Claystone, olive-gray to medium-gray, silty, laminated, micaceous, carbonaceous 1.0
Siltstone, medium-gray, clayey, laminated, micaceous; much iron stain on bedding planes; some hard layers weather pale yellowish brown 2.9
Thickness of Plumb Shale Member 16.8
Nebraska City Limestone Member:  
Limestone, olive-gray, very fine grained, very argillaceous, very thin bedded; olive-gray claystone interbeds; abundant crinoid stems, Derbyia, Juresania, and Orthomyalina 0.9
Thickness of Wood Siding Formation 25.6
Root Shale:  
French Creek Shale Member:  
Claystone (intensely weathered), olive-gray; upper contact gradational; shell fragments 0.3
Claystone, medium-dark-gray, silty; much iron stain and carbonaceous material on bedding planes .3
Coal (Lorton) (intensely weathered) .3
Claystone, medium-gray, silty; platy in lower part to poorly bedded in upper part; weathers light olive gray; much carbonaceous material and iron stain on bedding planes 1.4
Siltstone, laminated, micaceous; weathers light olive brown; disseminated carbonaceous material 1.5
Sandstone, olive-gray, very fine grained, laminated to platy; clayey siltstone Interbeds; weathers olive brown 1.0
Sandstone, light-gray, very fine grained, very thin bedded, calcareous, micaceous, hard; weathers to hard light-olive-gray concretionlike masses; disseminated carbonaceous material 1.9
Sandstone, olive-gray, very fine grained, laminated to platy; clayey siltstone interbeds; weathers olive brown 1.8
Covered interval; probably sandstone 3.3
Sandstone, olive-gray, very fine grained, laminated to platy; clayey siltstone interbeds in lower 0.6 ft; weathers olive brown 2.0
Siltstone, olive-gray, clayey, laminated, micaceous; many hard pale- to moderate-yellowish-brown ferruginous micaceous siltstone interbeds; upper contact gradational; finely disseminated carbonaceous material 7.8
Covered interval 5.8
Thickness of French Creek Shale Member 28.9
Jim Creek Limestone Member:  
Limestone, olive-gray, very fine grained, argillaceous, very thin to thin-bedded; weathers to pale-yellowish-brown to brownish-gray platy beds; many very ferruginous masses; much shell hash in relief; abundant fusulinids, crinoid stems, Reticulatia, Derbyia, and productoid spines; Orthomyalina and gastropods; poorly exposed; USGS fossil locality 19462-PO(fl2959) 0.4
Friedrich Shale Member:  
Claystone, olive-gray, silty, laminated, micaceous; weathers light olive gray; many moderate-yellowish-brown silty limestone lenses as much as 0.1 ft thick; limestone weathers to brown fragments 8.1
Claystone, mottled grayish-red, light-brown, and light-olive-gray; poorly exposed .6
Claystone; weathers light olive gray .2
Limestone, light-olive-gray, medium-light-gray, and pale-yellowish-brown, slightly argillaceous, medium- to thick-bedded; abundant limestone (?) pellets less than 0.01 ft thick; weathers to large tabular pitted blocks with rough, irregular upper surfaces; scattered nodules of light-red barite; abundant Osagia, crinoids, pelecypods, and gastropods; a few fusulinids; forms prominent ledge 2.0-3.8
Covered interval .8
Limestone, olive-gray; weathers to mottled light-olive-gray and yellowish-brown pitted rubbly blocks .4
Claystone, light-olive-gray, slightly silty, laminated to platy; many very thin layers of moderate-yellowish-brown ferruginous calcareous siltstone 4.5
Claystone, light-olive-gray; partly mottled with grayish red and light brown; slightly silty; platy 2.6
Claystone, grayish-red to light-brown, slightly silty, platy 1.6
Claystone, light-olive-gray .5
Covered interval; probably claystone 0.6
Claystone (deeply weathered), grayish-red to reddish brown and olive-gray; forms light-grayish-red outcrop; poorly exposed .9
Claystone, olive-gray, laminated; weathers light olive gray 2.8
Thickness of Friedrich Shale Member 25.6-27.4
Thickness of Root Shale 52.9-54.7
Stotler Limestone:  
Grandhaven Limestone Member:  
Limestone, light-olive-gray, very fine grained, slightly argillaceous; weathers to prominent light-olive-gray ledge; many ferruginous masses on upper surface; abundant crinoid stems, Reticulatia, and Meekella 0.7
Claystone, olive-gray, slightly silty; weathers light olive gray to light olive brown; irregular light-olive-gray very finely crystalline limestone bed near middle; fine shell hash throughout; Osagia in limestone bed .5
Limestone, light-olive-gray, very fine grained, slightly argillaceous ; weathers light olive gray mottled with moderate yellowish brown; an upper bed 0.3 ft thick and a lower bed 1 ft thick; forms ledge that has rough very ferruginous masses on upper surface; abundant fusulinids, Osagia, crinoid stems, ramose bryozoans, Chonetes, and Derbyia 1. 3
Thickness of Grandhaven Limestone Member 2.5
Dry Shale Member:  
Limestone (reef), light-olive-gray to pale-yellowish-brown, very finely crystalline, thin-bedded, coquinoidal; many round argillaceous limestone pellets as much as 0.02 ft in diameter (but most pellets are less than 0.01 ft in diameter); beds overlap progressively to the north; apparent dip is 3° SE; upper and lower contacts sharp, irregular; scattered small spots of green stain; abundant shell fragments (primarily pelecypods); some crinoid stems; exposed part of reef is about 100 yds long 0-2.4
Claystone, intensely weathered; light-olive-gray, silty, calcareous; abundant light-olive-gray very fine grained limestone pellets as much as 0.15 ft long and 0.5 ft thick in lower 0.2 ft; where reef is present, this unit is locally only 0.03 ft thick; poorly exposed 0.1-3.3
Thickness of Dry Shale Member 2.5-3.3
Dover Limestone Member:  
Limestone, deeply weathered; light-olive-gray, very fine grained, very argillaceous; probably thin bedded; lower 1.3 ft is olive gray mottled with olive brown, very clayey, and has hard layers; elsewhere lower part may grade laterally into underlying unit; abundant large fusulmids, algae (Cryptozoon), crinoid stems, horn corals, Chonetes, and Hustedia 3.0
Thickness of Stotler Limestone 8.0-8.8
Pillsbury Shale:  
Siltstone, olive-gray, platy to very thin bedded, finely micaceous; weathers light olive gray mottled by light olive brown; scattered pyrite; upper contact gradational; base not exposed 8.7+

8. Upper part of the French Creek Shale Member of the Root Shale down into the Pillsbury Shale

[Along U.S. Highway 40 in the SW SW sec. 30, T. 11 S., K. 13 E., Wabaunsee County (1 mile west of area)]

Root Shale: feet
French Creek Shale Member:  
Claystone, medium-gray, silty, platy; abundant chips of pale- to moderate-yellowish-brown iron-stained siltstone in upper 10 ft; weathers light olive gray; upper part not exposed 16.0+
Jim Creek Limestone Member:  
Limestone, light-olive-gray, very fine grained; argillaceous, especially in lower 0.7 ft; thin to medium bedded; weathers moderate yellowish brown; upper surface irregular, pitted, and greatly mottled with iron oxide; abundant small fragments of brachiopods and pelecypods (including Aviculopecten and Myalina?); fusulinids, crinoid stems, bryozoans 1.7
Friedrich Shale Member:  
Claystone, olive-gray, platy, micaceous; weathers light olive gray; many very small pyritic inclusions that weather dark yellowish brown 0.9
Siltstone, light-olive-gray, coarse, probably calcerous, finely micaceous; abundant very small pyritic (?) inclusions; weathers pale to moderate yellowish brown; forms ledge 3.4
Claystone, light-gray; upper contact sharp, slightly irregular 2.0
Claystone, medium-dark-gray, silty; many beds 0.05-0.3 ft thick of hard light-gray silty limestone that weathers pale yellowish brown; limestone contains many very small pyrite inclusions 2.8
Claystone, medium-dark-gray, silty, micaceous; many oval to kidney-shaped olive-gray to medium-gray dense argillaceous limestone concretions that weather moderate yellowish brown. Concretions are generally 0.07-0.25 ft thick and 0.1-0.6 ft long and contain narrow joints filled with white calcite, pyrite, and light-red barite 3.0
Claystone, dark-gray, silty, laminated, micaceous; very small pyrite inclusions that weather dark brown; several yellowish-gray siltstone beds as much as 0.15 ft thick in upper 2 ft; many clayey micaceous siltstone beds less than 0.05 ft thick that weather moderate yellowish brown 1.8 ft above base; siltstone weathers to hard iron-stained plates that contain finely disseminated carbonaceous material; claystone weathers olive brown in basal part and mainly pale yellowish brown in rest of unit; many very small shell fragments in basal 0.2 ft 12.7
Thickness of Friedrich Shale Member 24.8
Thickness of exposed Root Shale 42.5
Stotler Limestone:  
Grandhaven Limestone Member:  
Limestone, medium-gray, very fine grained; very argillaceous in upper 1 ft; very thin to medium bedded; some parts slightly pyritic; weathers light olive gray to moderate yellowish brown; weathers to thin rubbly plates in upper 1.2 ft; capped by very porous iron-rich layer 0.25 ft thick that contains large gypsum crystals; abundant fusulinids, bryozoans, and Composita, Juresania, and other brachiopod shells; abundant productoid spines; many fossil casts in upper 0.25 ft 3.3
Dry Shale Member:  
Claystone, olive-gray, silty, laminated, calcareous, slightly micaceous; many lenses as much as 0.1 ft thick of light-olive-gray to light-olive-brown very fine grained very argillaceous very fossiliferous limestone that contains many pellets as much as 0.02 ft in diameter of argillaceous limestone; abundant crinoid stems, bryozoans, Derbyia and other brachiopods, productoid spines, and Myalina and other pelecypods; forms inconspicuous reentrant 0.1-0.6
Dover Limestone Member:  
Limestone, light-olive-gray to light-brownish-gray, very fine grained, thin- to medium-bedded; argillaceous, particularly in lower 1.1 ft; weathers light brownish gray to pale yellowish brown; nodular rubble or platy fragments in upper 1 ft and lower 1 ft; upper contact uneven; abundant large fusulinids (USGS colln. f12963), algae (Cryptozoon), crinoid stems, and brachiopods; in addition, E. L. Yochelson (written commun., 1960) reported a rhomboporoid bryozoan, Meekoporella? sp. indet., Enteletes hemiplicatus (Hall), and Chonetes granulifer Owen 3.5
Thickness of Stotler Limestone 6.9-7.4
Pillsbury Shale:  
Claystone, olive-gray, very silty, platy; weathers light olive gray; abundant nodules 0.15 ft thick of medium-gray argillaceous pyritic limestone that weathers moderate yellowish brown; upper contact gradational; some fusulinids in upper 0.2 ft 3.4
Sandstone, light-olive-gray, very fine grained, silty, laminated, slightly crossbedded, very micaceous; weathers light olive gray to light olive brown; many very thin lenses and stringers of hard pyritic sandstone that weathers moderate brown; very carbonaceous on bedding planes; fairly resistant 3.7
Siltstone, medium-dark-gray to olive-gray, laminated, micaceous .6
Sandstone, light-olive-gray, very fine grained, silty, laminated, very micaceous; weathers moderate yellowish brown; at base is lenticular bed as much as 0.1 ft thick of finely crossbedded very pyritic sandstone that weathers moderate brown; basal contact gradational, uneven; carbonaceous fragments on bedding planes 1.2
Siltstone, medlum-dark-gray to olive-gray, laminated, micaceous; basal contact gradational .3
Sandstone, light-olive-gray, very fine grained, silty, laminated, very micaceous; carbonaceous material on bedding planes; basal contact gradational .4
Siltstone, medlum-dark-gray to olive-gray, laminated, micaceous 1.7
Sandstone, light-olive-gray, very fine grained, laminated; slightly crossbedded in lower half; very micaceous; weathers light olive to light olive brown; channel deposit; thins laterally 3.8
Claystone, and siltstone, medium-dark-gray, laminated to platy, very finely micaceous, slightly carbonaceous; weathers olive brown; clayey siltstone in upper 12.4 ft; very silty claystone in lower 10 ft; upper 2.4 ft contains very thin beds of very micaceous very carbonaceous very coarse siltstone that weathers light olive gray to light yellowish gray; entire unit contains nodules as much as 0.05 ft in in diameter of pyritic siltstone and is broken by vertical joints as much as 0.2 ft wide filled with siltstone that weathers pale yellowish brown; basal contact not exposed 22.4+
Thickness of exposed Pillsbury Shale 37.5+

9. Hawxby Shale Member of the Onaga Shale down into the uppermost part of the Pillsbury Shale

[In bank of Lomis Creek and eastward along road on the south line of the SE sec. 4, T. 13 S., R. 13 E., Wabaunsee County]

Onaga Shale: feet
Hawxby Shale Member:  
Limestone, white 1.0
Covered interval 6.0
Limestone, olive-gray to very pale yellowish brown; argillaceous; hard and dense in lower 1 ft; softer and slightly porous in rest of unit; many angular areas, mostly less than 0.02 ft thick but some as much as 0.2 ft long, possibly of algal origin; some angular areas striated; many pale-brown limonitic spots and streaks; weathers pale yellowish orange to yellowish gray; large and small holes in blocks 3.0
Covered interval; several platy beds of yellowish-gray silty micaceous limestone in lower 2 ft 13.6
Thickness of Hawxby Shale Member 23.6
Aspinwall Limestone Member:  
Limestone, yellowish-gray, laminated, hard, vertically jointed; weathers yellowish gray 0.5
Covered Interval 3.0
Limestone, very light gray, platy; weathers mottled yellowish gray and pale yellowish orange; a few Aviculopecten?; many other shells (apparently pelecypods) in basal part .6
Thickness of Aspinwall Limestone Member 4.1
Towle Shale Member (channel):  
Mostly covered interval; some light-olive-gray claystone; a few limestone concretions and platy beds of limestone 13.0
Claystone, light-olive-gray 5.0
Limestone, light-olive-gray; brown cone-in-cone structures at top .3
Covered interval 10.0
Claystone, light-olive-gray 3.0
Covered interval 15.0
Sandstone and siltstone, yellowish-gray, very finely micaceous; weathers yellowish gray 5.0
Sandstone, light-yellowish-gray to light-olive-gray, very fine grained; laminated, micaceous, carbonaceous; contains lenses generally 0.1-0.26 ft thick (some as much as 0.8 ft thick) of conglomeratic limestone. The limestone is medium light gray, very finely crystalline, sandy, micaceous, and hard and contains weathered subangular to subrounded granules and pebbles of light-yellowish-brown to dark-grayish-red dense argillaceous limestone, ironstone, and claystone. In places this unit forms the upper part of the ledge formed by the underlying limestone, but elsewhere it weathers to a slope 2.8
Limestone conglomerate; medium-light-gray, very finely crystalline, sandy, very thin to thin-bedded, hard; abundant subangular to subrounded granules and pebbles as much as 0.15 ft long and 0.05 ft thick of weathered light-yellowish-brown to dark-grayish-red dense argillaceous unfossiliferous limestone, ironstone, and claystone; much pyrite; many wood fragments and fossils; fossils include crinoid stems, bryozoans, and brachiopods (Marginifera, Chonetes, Reticulatia?, Derbyia, Chonetina); breaks into large slabs that split into irregular layers; forms prominent ledge 2.3
Siltstone, olive-gray, sandy, laminated to platy, micaceous; upper half contains siome platy beds of very fine grained sandstone that weathers light yellowish brown; carbonaceous material on bedding planes .5
Limestone conglomerate; medlum-light-gray to light-olive-gray very finely crystalline sandy limestone in irregular beds as much as 0.15 ft thick and containing pellets and nodules as much as 0.05 ft long of light-yellowish-brown argillaceous limestone, llmonite, claystone, and ironstone; many shell fragments; some wood fragments; weathers dark grayish red to dark reddish brown .6
Thickness of Towle Shale Member (channel) 57.5
Thickness of exposed Onaga Shale 85.2
Disconformity.  
Wood Siding Formation:  
Plumb(?) Shale Member:  
Sandstone, very fine grained, well-sorted, platy to very thin bedded, partly crossbedded, very micaceous; weathers light yellowish brown to light olive gray; platy beds of olive-gray sandy micaceous siltstone; upper contact moderately sharp, slightly irregular; lower contact poorly exposed; black carbonaceous material on bedding planes. Unit is 2 ft thick near south end of exposure; to the north, where underlying beds have been channeled out, it is more than 20 ft thick 2.0-20.0+
Unconformity.  
Root Shale:  
Friedrich Shale Member:  
Claystone, laminated to platy; weathers light olive gray to light olive brown; poorly exposed 0-2.7
Stotler Limestone:  
Grandhaven Limestone Member:  
Limestone, medium-light-gray to light-olive-gray, very fine grained, moderately argillaceous, thin-bedded; very fine light-olive-gray claystone laminae in zone 0.4 ft thick 1.1 ft above base; weathers light olive gray; upper weathered surface mottled moderate yellowish brown, dark reddish brown, and dark grayish red; forms ledge that splits into thin irregular plates; some medium-dark-gray mottling on bedding planes; abundant small fusulinids, crinoid stems, ramose bryozoans, brachiopods (including Chonetes, Marginifera?, Hustedia, and Derbyia), and productoid spines; outcrop partly slumped; lower contact concealed; channeled out laterally 0-2.2+
Dry Shale Member:  
Covered interval 0-6.8
Claystone, light-olive-gray, very slightly sllty; round white limestone nodules 0.04-0.08 ft in diameter in upper 1 ft; upper contact not exposed; claystone and overlying unit channeled out laterally 0-5.0
Thickness of Dry Shale Member 0-11.8
Dover Limestone Member:  
Limestone, light-gray to light-olive-gray, very fine grained, argillaceous; bedding irregular, obscure; sparsely pyritic; weathers light olive gray; pale to moderate-yellowish-brown and pale-red stain on weathered surfaces; breaks into large blocks that have irregular upper surface; abundant large fusulinids; many round masses of Cryptozoon-like algae; many crinoid stems, ramose bryozoans, hom corals, and brachiopods (including Composita, Crurithyris, and Hustedia); lower contact gradatlonal; channeled out laterally 0-1.7
Thickness of Stotler Limestone 0-15.7
Pillsbury Shale:  
Claystone, greenish-gray, calcareous platy; greenish-gray very argillaceous very fossiliferous limestone lenses as much as 0.05 ft thick and 0.15 ft long; abundant large fusulinids; many crinoid stems; some shell fragments; basal contact not exposed; channeled out laterally 0-2.0+

10. Aspinwall Limestone Member of the Onaga Shale Down, into the Tarkio Limestone Member of the Zeandale Limestone

[Along stream gullies and in roadcuts In the W2 NW and W2 SW sec. 31, T. 12 S., R. 14 E., Shawnee County]

Onaga Shale: feet
Aspinwall Limestone Member:  
Limestone, pale-yellowish-brown to grayish-orange, hard, brittle, porous; weathers pale yellowish orange; angular fragments as much as 0.05 ft long of medium-dark-gray algal(?) limestone that weathers very light gray; very small shell fragments 0.6
Claystone, light-olive-gray, slightly silty; weathers yellowish gray; forms angular rhombic fragments; several thin beds of yellowish-gray siltstone 1.8-3 ft below top 5.0
Limestone; very light gray with pink hue; cryptocrystalline, very thin to thin bedded; massive at top; well stratifled in middle; weathers yellowish gray; much dark-brown iron sitain in cracks; abundant Promytilus-type pelecypods in lower 0.7 ft 4.2
Thickness of Aspinwall Limestone Member 9.8
Towle Shale Member (channel):  
Claystone, greenish-gray; slightly silty in upper 3.5 ft; finely laminated, very micaceous; very carbonaceous on bedding planes; several beds of light-olive-gray platy micaceous siltstone and several very thin beds of ironstone near middle; many Lingula and ostracodes 8.3 ft above base 13.5
Limestone, light-brownish-gray, finely crystalline, very thin bedded; some angular areas as much as 0.04 ft long of yellowish-gray clayey limestone that weathers very pale orange; few Osagia?, crinoid stems, Derbyia, and Chonetes; caps underlying bed 0.2
Limestone, medium-gray, hard, dense, concretionary; weathers dark yellowish orange; abundant molluscan fragments; probably some Osagia .8
Claystone, light-grayish-olive, slightly silty 3.6
Sandstone, medium-gray, very fine grained, very calcareous, micaceous, hard, ripple-marked; much carbonaceous material; rests directly on underlying bed .9
Limestone conglomerate (base of channel); medium-light-gray hard sandy pyritic limestone containing abundant fragments less than 0.1 ft long (most less than 0.05 ft long) of dark claystone, Ironstone, yellowish-brown limestone, and shells; weathers light olive gray; many crinoid stems, Derbyia, Reticulatia, Chonetes, bellerophontid gastropods, and carbonized plant fragments. This bed is at the approximate stratigraphic position of the Grayhorse Limestone Member of the Wood Siding Formation that crops out to the southeast .7
Thickness of Towle Shale Member (channel) 19.7
Thickness of exposed Onaga Shale 29.5
Disconformity.  
Wood Siding (?) Formation:  
Plumb (?) Shale Member (channel):  
Siltstone, yellowish-gray, platy, very micaceous, carbonaceous; limestone conglomerate lens 2.2 ft long and 0.5 ft thick interbedded in uppermost part; weathers yellowish gray 1.3
Siltstone and sandstone, light-olive-gray and yellowish-gray, platy, micaceous, carbonaceous; sandstone is very fine grained 5.0
Covered Interval 14.0
Sandstone, light-olive-gray, micaceous; locally very calcareous; forms large hard crossbedded lenses that resemble limestone 10.0
Sandstone, light-olive-gray, micaceous, friable 10.0
Limestone (base of channel), light-gray, sandy, micaceous, concretionary; many large black carbonaceous fragments on bedding planes; forms series of elongate concretions; float indicates a possible conglomerate at base 1.0
Thickness of Plumb (?) Shale Member (channel) 41.3
Thickness of Wood Slding(?) Formation 41.3
Disconformity.  
Root Shale:  
French Creek Shale Member:  
Claystone, light-olive-gray with blue hue 5.5-8.0
Jim Creek Limestone Member:  
Limestone, light-gray, clayey, hard, vertically jointed; weathers to yellowish-gray angular fragments; scattered small fusulmids; abundant crinoid stems and brachiopods (including Chonetes and productoid spines) 0.6
Friedrich Shale Member:  
Claystone, light-olive-gray, very slightly silty, poorly bedded; weathers yellowish gray 9.8
Limestone, light-gray, very finely crysfalffrie; hard, conglomeratic; abundant angular pieces as much as 0.02 ft long of ironstone and green shale; weathers to single yellowish-gray bed .4
Claystone, grayish-red, mottled with grayish-olive, slightly silty; poorly exposed 2.3
Thickness of Friedrich Shale Member 12.5
Thickness of Root Shale 18.0-21.1
Stotler Limestone:  
Grandhaven Limestone Member:  
Limestone, light-gray; clayey, particularly in lower part; hard; weathers grayish orange; possible claystone parting 0.3 ft thick 0.5 ft below top; upper and lower parts form ledges in .stream; middle part rubbly; Osagia, scattered fusulinids, crinoid stems, and Reticulatia, Meekella, Chonetes, and Punctospirifer in upper part; ramose bryozoans, Derbyia, Orthomyalina, and Aviculopecten In lower part 2.5
Dry Shale Member:  
Claystone, light-olive-gray, slightly to moderately silty; weathers yellowish gray; a few pelecypods 0.5 ft below top; lower half not exposed 4.0
Dover Limestone Member:  
Limestone; very light gray with green hue, very argillaceous; weathers to rounded pale-yellowish-orange cobbles; abundant fusulinids; many algal deposits, (Cryptozoon), crinoid stems, horn corals, Neospirifer, and Meekella 2.7
Thickness of Stotler Limestone 9.2
Pillsbury Shale:  
Siltstone, greenish-gray, massive, micaceous; a few brachiopods about 2.5 ft below top 8.0
Slltstone and claystone, yellowish-gray, interbedded 4.0
Limestone, yellowish-gray, silty or sandy, hard, concretionary .9
Claystone, siltstone, and sandstone, yellowish-gray, micaceous; claystone is silty 33.2
Covered interval 15.0
Thickness of Pillsbury Shale 61.1
Zeandale Limestone:  
Maple Hill Limestone Member:  
Limestone, pale-yellowish-brown with green areas, clayey, hard, vertically jointed; weathers to single grayish-orange bed; red splotches on upper surface; abundant small fusulinids; many Osagia? Cryptozoon-like algae, crinoid stems, ramose bryozoans, Crurithyris, Chonetes, and low- and high-spired gastropods 1.2
Wamego Shale Member:  
Claystone, medium-gray, very slightly silty, finely laminated; weathers very light gray 3.0
Covered interval 11.5
Thickness of Wamego Shale Member 14.5
Tarkio Limestone Member:  
Limestone, hard, vertically jointed; weathers to orange-brown beds about 0.7 ft thick; abundant large fusulinids in relief; many Cryptozoon-like algae, crinoid stems, horn corals, Meekella, and Reticulatia; base not exposed 4.0+
Thickness of exposed Zeandale Limestone 19.7+

11. Base of the Foraker Limestone down into the West Branch Shale Member of the Janesville Shale

[In streambank and up hillside Immediately west in the center of the N2 sec. 29, T. 13 S., R. 13 E., Wabaunsee County]

Foraker Limestone: feet
Americus Limestone Member: not measured.  
Janesville Shale:  
Hamlin Shale Member:  
Covered interval; upper contact arbitrarily chosen 32.5
Claystone, olive-gray; weathers light olive gray; abundant round nodules less than 0.04 ft in diameter of argillaceous pyritic limestone that weathers moderate yellowish brown; upper contact not exposed 3.1
Claystone, light-olive-gray, very calcareous; very argillaceous limestone lens locally in upper 2.4 ft; weathers to light-olive-gray outcrop covered with abundant round argillaceous limestone nodules 3.6
Thickness of Hamlin Shale Member 39.2
Five Point Limestone Member:  
Limestone, light-olive-gray, very fine grained, argillaceous, very thin to thin-bedded; a few moderate-brown-weathering pyritic inclusions; weathers light olive gray to light yellowish gray; forms ledge 2.5
Claystone, calcareous; weathers light olive gray; poorly exposed 3.1
Limestone, medium-light-gray to light-olive-gray, very fine grained, moderately argillaceous, thin- to medium-bedded, hard, vertically jointed; weathers light olive gray to light yellowish gray; forms ledge that breaks into large blocks; abundant crinoid stems, ramose bryozoans, Chonetes, Derbyia, Reticulatia, and Marginifera; a few trilobites 2.2
Thickness of Five Point Limestone Member 7.8
West Branch Shale Member:  
Claystone (intensely weathered), dark-olive-gray to olive-brown, platy, calcareous; light-olive-gray argillaceous fossiliferous limestone lens as much as 0.25 ft thick and 3 ft long in upper 0.6 ft; shell fragments in upper half 1.3
Claystone, black, very finely laminated; coaly in lower half; much iron enrichment; weathers to medium-dark-gray fissile pieces .5
Sandstone, light-gray, very fine grained; weathers light olive gray to light olive brown; moderately resistant .5
Siltstone, light-olive-gray, laminated, micaceous; intercalated with thinner beds of medium-gray silty micaceous claystone; outcrop weathers light olive gray and is stained reddish brown by iron; upper contact gradational; much carbonaceous material on bedding planes 3.4
Limestone, medium-gray, very fine grained to very finely crystalline, slightly argillaceous, hard, dense; platy to very thin bedded in lower 0.6 ft and upper 0.3 ft; rest of unit forms single bed; weathers light olive gray to light olive brown; upper contact gradational; abundant small fragments of brachiopods, pelecypods, and gastropods 3.3
Siltstone, medium-dark-gray, clayey, laminated, micaceous; weathers olive gray to olive brown; olive-gray platy silty fosslliferous limestone layers in upper 0.2 ft; upper contact gradational; abundant brachiopod shells and spines and pelecypods; base not exposed in stream 1.5+
Thickness of exposed West Branch Shale Member 10.5+
Thickness of exposed Janesville Shale 57.5+

12. Five Point Limestone Member of the Janesville Shale dozen, into the upper part of the Pillsbury Shale

[Along road from the center of the S2 sec. 2 southward to top of hill In the SW NE sec. 11, T. 13 S., R. 13 E., Shawnee County]

Janesville Shale: feet
Five Point Limestone Member:  
Limestone, olive-gray, argillaceous; abundant shell fragments; poorly exposed; upper contact not exposed 0.2+
Limestone (intensely weathered), dark-yellowish-orange, argillaceous, porous; shell fragments; poorly exposed .3
Limestone, light-gray, very argillaceous; weathers similar to claystone; very poorly exposed 1.0
Limestone, medium-gray, very fine grained, hard, compact; weathers to light-yellowish-gray granular-appearing plates that contain many holes; upper contact gradational; abundant fusulinids, crinoid stems, ramose, fenestrate, and encrusting bryozoans, and brachiopods (including Punctospirifer); some Osagia; forms ledge 1.4
Thickness of exposed Five Point Limestone Member 2.9+
West Branch Shale Member:  
Claystone; calcareous in upper 2.3 ft; weathers light olive gray; contains argillaceous-limestone beds less than 0.1 ft thick that weather light yellowish gray, and a middle bed 0.5 ft thick of very argillaceous limestone that weathers dark yellowish orange; weathers light olive brown in lower 2.2 ft; abundant very small shell fragments in the limestone beds; poorly exposed 5.0
Coal, black .1
Sandstone, light-olive-gray, very fine grained, laminated to platy, very micaceous; weathers light olive gray to light olive brown; much iron stain; much carbonaceous material on bedding planes 4.5
Limestone, olive-gray, very silty to finely sandy; very small braehlopod shells and spines .2
Siltstone, medium-gray, slightly sandy, laminated, micaceous; weathers medium light gray to moderate olive brown 1.4
Sandstone, light-olive-gray, very fine grained, laminated to platy, very micaceous; weathers light olive gray to light olive brown; much iron stain; much carbonaceous material on bedding planes 7.2
Coal (intensely weathered), brownish-black, very clayey .2
Claystone, light-olive-gray; calcareous except in lower 0.5 ft; very calcareous in upper part; laminated to platy; some thin light-olive-gray argillaceous limestone beds; weathers to a light-olive-gray to light-yellowish-gray outcrop that has a honeycomb appearance owing to vertical joints filled with more resistant claystone 3.7
Limestone, light-olive-gray, very fine grained, very argillaceous; olive-gray platy calcareous claystone partings less than 0.1 ft thick in upper 1.9 ft; partings weather to light-yellowish-orange to light-yellowish-brown platy beds, some of which have honeycomb appearance; weathers to Ifght-yellowish-orange boxwork in lower 1 ft 2.9
Claystone, platy; weathers light olive gray to light olive brown mottled with some medium dark gray and olive gray 1.5
Limestone, very argillaceous; weathers to hard light-yellowish-orange rubble 1.1
Claystone, platy, weathers light olive gray to light olive brown mottled with some medium dark gray and olive gray 2. 5
Thickness of West Branch Shale Member 30.3
Thickness of exposed Janesville Shale 33.2
Falls City Limestone:  
Limestone, light-olive-gray, slightly argillaceous, hard, compact; some very thin light-olive-gray claystone partings; weathers to light-olive-gray, dark-yellowish-brown, and olive-brown nodular beds as much as 0.3 ft thick; bryozoans, brachiopods, pelecypods, gastropods; less resistant than underlying bed 1.1
Limestone, light-olive-gray, slightly argillaceous, hard, compact; weathers to single bed that is light olive gray, dark yellowish brown, and olive brown; many gastropods and pelecypods; some fenestrate bryozoans and brachiopods .6
Claystone, calcareous; weathers light olive gray; many very small light-yellowish-gray argillaceous limestone nodules; basal contact not exposed 2.0
Thickness of exposed Falls City Limestone 3.7
Lower part of Falls City Limestone, and the Hawxby Shale Member and upper part of Aspinwall Limestone Member of the Onaga Shale:  
Covered interval 23.5
Onaga Shale:  
Aspinwall Limestone Member:  
Claystone, calcareous; weathers light olive gray to light olive brown; contains 5 beds 0.1 to 0.2 ft thick of light-olive-gray argillaceous platy limestone that weathers to light-olive-gray to light-yellowish-gray nodular to platy fragments; some shell fragments in limestone beds 2. 7
Limestone, light-olive-gray to light-gray, very finely crystalline, hard, compact; weathers to light-olive-gray to light-yellowish-brown granular blocks that contain small areas of compact very fine grained limestone and many pyritic spots that weather dark brown; abundant very small fossil debris, including many very small white foraminifers(?) or algae .4
Thickness of exposed Aspinwall Limestone Member 3.1
Towle Shale Member (channel):  
Siltstone and sandstone, interbedded; sandy laminated to platy siltstone interbedded with a lesser amount of very fine grained sandstone; both weather light olive gray to light olive brown; some olive-gray silty platy claystone in lower 5 ft 16.0
Sandstone, medium-light-gray, very calcareous, platy to medium-bedded; crossbedded in lower half; hard; weathers pale yellowish brown; oscillation ripple marks common; carbonaceous fragments on bedding planes; forms ledge 2.2
Partly covered Interval; interbedded light-olive-gray micaceous sandstone, claystone, and siltstone; all weather yellowish gray 14.5
Sandstone, medium-light-gray, silty, very calcareous platy to very thin bedded, micaceous; platy interbeds of claystone; weathers pale yellowish brown; closely resembles limestone; oscillation ripple marks; plant fragments 1.4
Sandstone and siltstone, interbedded; light olive gray, platy, micaceous; weather yellowish gray; sandstone is very fine grained; some carbonaceous layers 4.0
Covered Interval 7.0
Limestone, very light gray to light-brownish-gray, very finely sandy, partly crossbedded, hard, brittle; conglomerate of ironstone concretions and claystone fragments in limestone matrix in lower 0.5 ft; few interbeds of noncalcareous sandstone; weathers light olive gray; carbonaceous fragments in conglomerate 4.5
Sandstone, dark-yellowish-brown, very fine grained, micaceous, friable; weathers yellowish gray 4.0
Covered interval 7.5
Limestone, very light gray with pink hue, sandy, hard; weathers pale yellowish brown; many round ironstone concretions; a few fragments of gray claystone; poorly exposed .7
Thickness of exposed Towle Shale Member (channel) 61.8
Thickness of exposed Onaga Shale 64.9
Basal part of Onaga Shale, and possible lower part of Root Shale and upper part of Stotler Limestone:  
Covered interval 27.0
Stotler Limestone:  
Dover Limestone Member:  
Limestone, pale-grayish-orange, interbedded with calcareous claystone; weathers to irregular nodular blocks; varies laterally from very argillaceous to almost pure limestone; crinoid stems and Reticulatia 1.5
Limestone, grayish-yellow; some green areas; argillaceous, hard; weathers to a single irregular pale-grayish-orange bed; scattered large fusulinids; many Cryptozoon-like algae, crinoid stems, and horn corals 1.7
Thickness of Dover Limestone Member 3.2
Thickness of exposed Stotler Limestone 3.2
Pillsbury Shale:  
Claystone, light-olive-gray, slightly silty; calcareous in upper 0.9 ft; weathers grayish yellow; very fossiliferous in upper 1 ft; a few brachiopods about 3 ft below top; abundant fusulinids; some crinoid stems; a few Meekella and Juresania; base not exposed 10.0+

13. Long Creek Limestone Member of the Foraker Limestone down into the upper part of the Hamlin Shale Member of the Janesville Shale

[Along stream and up hillside immediately west In the NE SW sec. 29, T. 13 S., R. 13 E. Wabaunsee County]

Foraker Limestone: feet
Long Creek Limestone Member:  
Mostly covered interval; light- to moderate-yellowish-brown very fine grained to very finely crystalline argillaceous porous limestone cobbles; scattered fragments of white to moderate-reddish-orange chert, barite, and calcite that probably weathered from the limestone; underlies crest of ridge 5.0+
Hughes Creek Shale Member:  
Mostly covered interval; lower 6 ft is calcareous claystone that weathers light olive gray and contains beds as much as 0.22 ft thick of light-olive-gray argillaceous limestone; many fusulinids and brachiopod fragments in claystone and limestone beds 17.7
Claystone, laminated, calcareous; weathers light olive gray; abundant fusulinids and brachiopods 1.0
Limestone, olive-gray, very fine grained, argillaceous; weathers light olive gray; abundant fusulinids and brachiopods .6
Claystone, calcareous; weathers olive gray to moderate olive brown; very thin black claystone laminae at base; abundant brachiopod fragments .2
Limestone, medium-dark-gray, very fine grained; slightly argillaceous, especially in upper 0.2 ft; hard; vertically jointed; weathers to fairly large blocks that are light olive gray mottled with medium dark gray on upper surface; in two beds, the upper of which is 0.6 ft thick; abundant large fusulinids and brachiopods 1.1
Covered interval; probably claystone 9.3
Claystone, very calcareous; weathers light yellowish gray to light olive gray; many beds generally less than 0.1 ft thick (some as much as 0.25 ft thick) of light-olive-gray very fine grained argillaceous limestone; limestone weathers as hard plates mottled light olive gray, olive brown, and dark yellowish orange; abundant fusulinids, crinoid stems, ramose and fenestrate bryozoans, and brachiopods (Including Chonetes, Hustedia, Juresania, Composita, Reticulatia, and Meekella) in claystone and limestone; upper contact not exposed 5.3
Thickness of Hughes Creek Shale Member 35.2
Americus Limestone Member:  
Limestone, medium-light-gray, very fine grained, sparsely pyritic, vertically jointed; weathers to single light-olive-gray to light-gray bed that breaks into blocks as much as 6 ft wide and 20 ft long; blocks slump onto underlying beds; abundant fusulinids and crinoid stems; many very small fragments of brachiopods and fenestrate bryozoans 1.1
Covered interval; probably claystone 2.5
Limestone, medium-dark-gray, fine-grained, slightly argillaceous; weathers to thin irregular platy granular-appearing fragments that are mottled medium dark gray, light olive gray, and dark yellowish orange; many very small fragments of brachiopods, pelecypods, and very small gastropoda(?) 1.0
Claystone, olive-brown, very calcareous, interbedded with very argillaceous limestone of same color; weathered; forms slight reentrant .1
Limestone, medium-light-gray, very fine grained, moderately argillaceous, thin- to medium-bedded; forms two granular-appearing units that weather light gray; top of lower unit is very argillaceous and weathers yellowish gray to dark yellowish orange; abundant foraminifers(?) and ostracodes in both units; upper 0.8 ft contains well-preserved myalinid pelecypods; lower 0.2 ft contains lobate masses of stromatolltes that are olive gray, hard, and dense 1.0
Thickness of Americus Limestone Member 5.7
Thickness of exposed Foraker Limestone 45.9+
Janesville Shale:  
Hamlin Shale Member:  
Mostly covered interval; calcareous silty claystone that weathers dark yellowish orange exposed at base and top 3.3
Limestone, olive-gray, very fine grained, very argillaceous; weathers to light-olive-gray nodular to rubbly bed; forms ledge in gully 2.0
Claystone, greenish-gray to olive-gray, laminated to platy, slightly micaceous; nodules and lenses of light-olive-gray clayey limestone that weathers olive gray to olive brown and porous 2.3
Limestone, very fine grained, very argillaceous; weathers light olive gray and porous; grades laterally to claystone .5
Claystone, greenish-gray to olive-gray, laminated to platy, slightly micaceous; nodules and lenses generally less than 0.2 ft long of light-olive-gray clayey limestone that weathers olive gray to olive brown and porous 3.3
Siltstone, greenish-gray, laminated, very micaceous; weathers olive gray to light greenish gray; upper contact gradational .5
Claystone, greenish-gray, very calcareous, laminated; weathers olive gray mottled with moderate yellowish orange; sllty platy limestone lenses less than 0.2 ft long; basal contact not exposed in stream .8+
Thickness of exposed Hamlin Shale Member 12.7
Thickness of exposed Janesville Shale 12.7

14. Hughes Creek Shale Member of the Foraker Limestone down to the base of the Aspinwall Limestone Member of the Onaga Shale

[In streambank in the NW SE sec. 1, and along adjacent road on the north line of the SE sec. 1, T. 10 S., R. 12 E., and In readouts in the SW cor. NW sec. 6, T. 10 S., R. 13 E., Shawnee County]

Foraker Limestone: feet
Hughes Creek Shale Member:  
Claystone, light-olive-gray; beds less than 0.05 ft thick of clayey limestone that weathers light olive brown; crinoid stems, bryozoans, very small shell fragments; upper contact not exposed 4.5
Limestone, light-olive-gray, very fine grained, silty, very thin to thin-bedded; many crinoid stems, bryozoans, and minute shell fragments; some ostracodes .7
Claystone, light-olive-gray, calcareous; weathers light grayish yellow to light olive gray; many beds less than 0.05 ft thick of clayey limestone that weathers light olive brown; outcrop has banded appearance on weathering; many crinoid stems, ramose bryozoans, and minute shell fragments 5.3
Limestone, light-olive-gray, very fine grained, silty, very thin to thin-bedded; abundant minute shell fragments .5
Claystone, light-olive-gray, calcareous; weathers light grayish yellow to light olive gray; abundant oval pellets as much as 0.02 ft long of light-olive-gray limestone; minute fossil fragments 1.0
Limestone, light-olive-gray, very fine grained, silty, very thin to thin-bedded; abundant shell fragments .7
Claystone, light-olive-gray; weathers light olive gray to light grayish yellow; partly covered 3.8
Limestone, light-olive-gray, very fine grained, silty, very thin bedded, very finely pyritic;, beds as much as 0.12 ft thick; abundant minute fossil fragments, foraminifers, crinoid stems, echinoid spines, bryozoans, Chonetes and other brachiopods, and productoid spines 1.3
Claystone, light-olive-gray, calcareous; weathers light grayish yellow; many oval pellets as much as 0.02 ft long of light-olive-gray limestone; fusulinids, crinoid stems, ramose bryozoans, and minute shell fragments; partly covered 4.0
E. L. Yochelson (written commun., 1900) identified these following forms from the Hughes Creek Shale Member: Fusulinids, undet. (USGS colln. f12956), Chonetes granulifer Owen, Linoproductus sp., Neospirifer cf. N. kansasensis (Swallow)  
Thickness of exposed Hughes Creek Shale Member 21.8
Americus Limestone Member:  
Limestone, medium-gray, finely crystalline; weathers medium light gray to light olive gray; forms single vertically jointed bed, the upper part of which breaks into thin platy fragments; small light-red barite nodules; abundant crinoid stems, ramose bryozoans, and brachiopods (including Chonetes, Reticulatia, Marginifera?, and Crurithyris); fossils weather in relief; forms prominent bench 1.8
Claystone (intensely weathered), pale-yellowish-brown, calcareous; many white to very light gray very argillaceous limestone nodules as much as 0.03 ft long and 0.01 ft thick .3
Limestone, light-olive-gray to medium-light-gray, very fine grained to very finely crystalline, moderately argillaceous; weathers light gray to light brownish gray; moderately resistant; a few very thin lenses of light-olive-gray calcareous claystone in lower part; upper part appears to be mainly matrix of foraminifers containing many ostracodes; basal 0.1 ft contains lobate masses of medium-gray dense algal deposits (stromatolites) that weather pale yellowish brown and commonly appear striated .5
Thickness of Americus Limestone Member 2.6
Thickness of exposed Foraker Limestone 24.4
Janesville Shale:  
Hamlin Shale Member:  
Claystone, slightly silty and micaceous, laminated; weathers pale yellowish brown; forms blocky fragments; a few small calcareous siltstone pellets that weather moderate yellowish brown; many plant fragments; partly covered 1.0
Claystone, light-olive-gray, slightly silty; nodules and lenses as much as 0.05 ft thick of light-olive-gray very argillaceous limestone that weathers to hard yellowish-gray to very light gray fragments; partly covered 12.7
Claystone, light-olive-gray, slightly silty 1.9
Thickness of exposed Hamlin Shale Member 15.6
Lower part of Hamlin Shale Member, Five Point Limestone Member, and West Branch Shale Member:  
Covered interval 40.6
Thickness of Janesville Shale 56.2
Falls City Limestone:  
Limestone, light-gray to very light olive gray, fine-grained, slightly micaceous, coquinoidal; lenses less than 0.01 ft thick and 0.1 ft long of very light greenish gray dense limestone; weathers to single light-yellowish-brown bed that has a banded and granular appearance; upper surface weathers irregular, castellated; very small fossil fragments, some recrystallized, including some Osagia, crinoid stems, and gastropods 1.7
Claystone, light-olive-gray, calcareous .2
Limestone, light-olive-gray, very fine grained, silty, slightly micaceous, coquinoidal; weathers to single light-yellowish-brown bed that has indistinct banding and a granular appearance; minute shell fragments, and a few Osagia and crinoid stems 1.3
Thickness of Falls City Limestone 3.2
Onaga Shale:  
Hawxby Shale Member:  
Covered Interval 1.6
Limestone, dense to very fine grained, argillaceous; weathers to sharp-edged fragments that are moderate yellowish brown to dark yellowish orange; some brachiopod shells and spines 2.1
Covered interval; siliceous sandstone fragments as much as 0.7 ft long; vugs filled with quartz crystals 3.5
Sandstone, very fine grained, very thin bedded, weathers light brown; greenish-gray claystone inclusions as much as 0.01 ft long; upper contact not exposed .8
Claystone, light-olive-brown, slightly silty, laminated; some brownish-black stain on bedding planes and joints; scattered carbonaceous material 1.9
Limestone, light-olive-gray, very finely crystalline, argillaceous; weathers moderate yellowish brown; abundant gastropods and myalinid pelecypods .5
Claystone, light-olive-brown, slightly silty, laminated; some brownish-black stain on bedding planes; sparse carbonaceous material .3
Limestone, light-olive-gray, very fine crystalline, argillaceous; weathers moderate yellowish brown; abundant myalinid pelecypods and gastropods .1
Claystone, light-olive-brown, slightly silty, laminated; some brownish-black stain on bedding planes .1
Limestone, light-olive-gray, very fine crystalline, argillaceous; weathers pale yellowish brown; pelecypods and gastropods .1
Claystone, light-olive-brown, slightly silty, laminated; some brownish-black stain on bedding planes and joints; two light-olive-gray very finely crystalline argillaceous limestone beds less than 0.04 ft thick that weather moderate yellowish brown in upper 0.3 ft; abundant myalinid pelecypods and gastropods in limestone beds; sparse carbonaceous material in claystone 5.7
E. L. Yochelson (written commun., 1960) identified the following forms from the limestone beds: Abundant Permophorus sp. indet., Glabrocingulum? sp. indet., High-spired gastropods  
Thickness of Hawxby Shale Member 16.7
Aspinwall Limestone Member:  
Limestone, light-gray, very fine grained, slightly argillaceous, moderately pyritie; single bed that weathers to smooth plates mottled light gray and light yellowish gray and containing many very small vugs partly filled with pyrite that weathers, dark yellowish orange; many minute shell fragments, especially in upper part; some gastropods and ostracodes 2.3
Thickness of exposed Onaga Shale 19.0

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Kansas Geological Survey, Geology
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