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Ruzhencev & Bogoslovskaya |
1978 |
Namyurskiy etap v evolyutsii ammonodey. Pozdnenamyurskiye ammonoidei.
Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 167: 1-336, fig.1-108, pl.1-44; Moskva.
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Saunders & Ramsbottom |
1993 |
Re-evaluation of two Early Pennsylvanian (Middle Namurian) ammonoids and their bearing on mid-Carboniferous correlations.
Journal of Paleontology, 67: 993-999, 3 figs., Lawrence, KA.
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