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Boardman, Work & Mapes |
1994 |
Biostratigraphy of Middle and Late Pennsylvanian (Desmoinesian-Virgilian) ammonoids. [Boardman,D.R., D.M.Work, Mapes,R.H. & Barrick,J.E.].
Kansas Geological Survey Bulletin 232, 121 p., 26 figs., 1 tabl., 5 pls., Lawrence, KS.
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Newell |
1936 |
Some Mid-Pennsylvanian invertabrates from Kansas and Oklahoma: III. Cephalopoda.
Journal of Paleontology, 10: 481-489, fig.1-2, pl.68-72; Menasha,Wis.
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