Where: Garfield County, Montana (47.0° N, 107.9° W: paleocoordinates 47.2° N, 66.7° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Metoicoceras mosbyense ammonoid zone, Mosby Sandstone Member (Belle Fourche Formation), Late/Upper Cenomanian (99.6 - 93.5 Ma)
• group of beds-level stratigraphic resolution
Environment/lithology: marine; lithified sandstone
Size class: macrofossils
Collected by W.A. Cobban in 1948; reposited in the USNM
Primary reference: W. A. Cobban. 1953. Cenomanian ammonite fauna from the Mosby Sandstone of central Montana. United States Geological Survey Professional Paper 243-D:45-55 [M. Clapham/K. Okamoto/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 168055: authorized by Matthew Clapham, entered by Matthew Clapham on 14.04.2015
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Trachytriton "n. sp." Meek 1864 triton shell | |
? Anchura sp. Conrad 1860 snail | |
Lunatia cf. dakotensis moon snail
Gyrodes conradi moon snail | |
Bivalvia | |
"Trigonocallista orbiculata" = Cyclorisma orbiculata
"Trigonocallista orbiculata" = Cyclorisma orbiculata Hall and Meek 1870 venus clam | |
Gervillia sp. Defrance 1820 oyster | |
Exogyra columbella oyster
Gryphaea "n. sp." Lamarck 1801 oyster | |
Inoceramus aff. fragilis Hall and Meek 1856 clam | |
Cephalopoda | |
Metoicoceras mosbyense, "Dunveganoceras albertense" = Dunveganoceras (Dunveganoceras) albertense
Metoicoceras mosbyense Cobban 1953 ammonite
"Dunveganoceras albertense" = Dunveganoceras (Dunveganoceras) albertense Warren 1930 ammonite ssp. montanense
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