Edited by oilshale
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Reticycloceras sp.
Images: 
By oilshale (edited)
Taxonomy
Orthoconic Nautiloid Cephalopod
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Pseudorthocerida
Family: Spyroceratidae
Genus: Reticycloceras
Species: Reticycloceras sp.
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
Length: 80 mm
Width: 20 mm
Location
Bear Gulch
Fergus County
Montana
United States
Comments
With soft part preservation.
Lit.:
Landman, N. H., and R. A. Davis, 1988. "Jaw and crop preserved in an orthoconic nautiloid cephalopod from the Bear Gulch Limestone (Mississippian, Montana)."
Mapes, R. S. 1987. "Upper Paleozoic cephalopod mandibles: frequency of occurrence, modes of preservation, and paleoecological implications". Journal of Paleontology 61: 521-538.
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