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Gordon |
1965 |
Carboniferous Cephalopods of Arkansas.
Professional Papers, U.S. Geological Survey, 460: 1-322, fig.1-96, pl.1-32; Washington. [imprint 1964].
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Kullmann & Nikolaeva |
1995 |
A Review of Upper Namurian ammonoid biostratigraphy.
Newsletters on Stratigraphy, 32: 117-136, 10 figs., Berlin, Stuttgart.
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Manger & Saunders |
1980 |
Lower Pennsylvanian (Morrowan) ammonoids from the North American midcontinent.
Journal of Paleontology, 54, Suppl.(3): 1-56, fig.1-21, pl.1-6, tab.1-10; Tulsa, Okla.
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