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Orbiculoidea missouriensis Shumard, 1858
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By oilshale
Taxonomy
Lamp Shell
Kingdom: Animalia
Phylum: Brachiopoda
Class: Lingulata
Order: Lingulida
Family: Discinidae
Genus: Orbiculoidea
Species: Orbiculoidea missouriensis
Author Citation Shumard, 1858
Geological Time Scale
Eon: Phanerozoic
Era: Paleozoic
Period: Carboniferous
Sub Period: Mississippian
Epoch: Late
International Age: Serpukhovian
Stratigraphy
Big Snowy Group
Heath Formation
Bear Gulch Bed
Provenance
Acquired by: Purchase/Trade
Dimensions
Diameter: 2 cm
Location
Bear Gulch
Fergus County
Montana
United States
Comments
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.
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