Kansas Geological Survey, Current Research in Earth Sciences, Bulletin 241, part 1
Allostratigraphic and Sedimentologic Applications of Trace Fossils to the Study of Incised Estuarine Valleys

Fig. 19. Helminthopsis hieroglyphica, X1.3. Note the presence of poorly preserved specimens of Tonganoxichnus buildexensis and Undichna britannica (left)

Kansas Geological Survey
Web version March 19, 1998
http://www.kgs.ku.edu/Current/1998/buatois/fig19.html
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