J. Brookes Knight, Robert E. King; Are the "Omphalotrochus beds" of the U.S.S.R. Permian?. AAPG Bulletin ; 24 (6): 1128–1133. doi:
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A discussion by J. Brookes Knight, Carl O. Dunbar, and Robert E. King advocating the inclusion of beds bearing Omphalotrochus and Waagenoconcha in the basal Permian of Russia and of the Andes mountains.
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