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Showing results for tags 'orbiculoidea'.
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Lit.: EDWIN K. MAUGHAN and ALBERT E. ROBERTS (1967): Big Snowy and Amsden Groups and the Mississippian-Pennsylvanian Boundary in Montana. GEOLOGICAL SURVEY PROFESSIONAL PAPER 554 7 B Lutz-Garihan, A.B. (1979). Brachiopods from the Upper Mississippian Bear Gulch Limestone of Montana. Neuvieme Congres International de Stratigraphie et de Geologie du Carbonifere. Compte Rendu Vol. 5: 457-467 pp. EDIT: Subperiod is Mississippian and Epoch is Late.
I am reasonably sure this is an Orbiculoidea. I know this is not a spectacular fossil but if it is Orbiculoidea, it is the first I have found. I am thinking Orbiculoidea missouriensis but it lacks the finer growth lines that I see in some photos. I am looking for opinions on ID and wondering if anyone else can show any examples of Orbiculoidea they have found! Thanks Brachoipod Orbiculoidea sp. Pennsylvanian, Winterset limestone, Kansas City, Missouri, Jackson co. pic1 pic2 pic3