USGS Mesozoic 23361, Fort Peck (Cretaceous of the United States)

Where: Montana (48.0° N, 106.3° W: paleocoordinates 54.4° N, 72.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Bearpaw Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• Unit 6, middle part

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified shale

Size class: macrofossils

Reposited in the USNM

Primary reference: F. S. Jensen and H. D. Varnes. 1964. Geology of the Fort Peck area, Garfield, McCone and Valley counties, Montana. United States Geological Survey Professional Paper 414-F:1-49 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 212997: authorized by Matthew Clapham, entered by Matthew Clapham on 23.08.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Nuculida - Nuculidae
 Nuculanida - Yoldiidae
Yoldia evansi Meek and Hayden 1857 clam
 Pectinida - Pectinoidae
 Pectinida - Oxytomidae
Pteria (Oxytoma) nebrascana Evans and Shumard 1857 scallop
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Myalinida - Inoceramidae
"Inoceramus sagensis" = Inoceramus (Cataceramus) sagensis
"Inoceramus sagensis" = Inoceramus (Cataceramus) sagensis Owen 1852 clam
 Mytilida - Mytilidae
Volsella sp. Scopoli 1777 mussel
 Poromyida - Cuspidariidae
 Cardiida - Cardiidae
"Leptocardia subquadrata" = Protocardia (Leptocardia), Leptocardia borealis
"Leptocardia subquadrata" = Protocardia (Leptocardia) cockle
Leptocardia borealis Whiteaves 1885 cockle
 Carditida - Astartidae
Scaphopoda
 Dentaliida - Dentaliidae
Gastropoda
 Sorbeoconcha - Naticidae
Polinices sp. Monfort 1810 moon snail
 Sorbeoconcha - Aporrhaidae
 Vanikoroidea - Vanikoridae
 Opisthobranchia - Scaphandridae
 Heterostropha - Acteonidae
? Acteon sp. Montfort 1810 snail
Cephalopoda
 Ammonitida - Baculitidae