Kansas Geological Survey, Current Research in Earth Sciences, Bulletin 243, part 1
Sedimentology and Ichnology of Paleozoic Estuarine and Shoreface Reservoirs, Morrow Sandstone, Lower Pennsylvanian of Southwest Kansas, USA

Fig. 2. Isopach map of the lower Morrow Sandstone in the Gentzler field showing location of Gaskill No. 10-2 and Nell "A" 19-1 wells. Contour interval = 20 feet (6.1 m).