Cedar Creek Gulch, Beaverhead County (Permian of the United States)

Where: Montana (45.0° N, 112.9° W: paleocoordinates 17.1° N, 33.1° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Retort Member (Phosphoria Formation), Lopingian (259.9 - 252.2 Ma)

• Davydov et al. 2017 dated an ash bed in the upper Meade Peak Member at 260.57 ± 0.07 / 0.14 / 0.31 Ma, indicating that the Meade Peak is as young as uppermost Capitanian.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified limestone

• Limestone tongue of Retort Member

Size class: macrofossils

Primary reference: K.W. Ciriacks. 1963. Permian and Eotriassic bivalves of the middle Rockies. Bulletin of the American Museum of Natural History 125(1):1-100 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 88662: authorized by Matthew Clapham, entered by Matthew Clapham on 17.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Cardiida - Kalenteridae
Pseudopermophorus annettae
Pseudopermophorus annettae Ciriacks 1963 clam
 Carditida - Astartidae
Astartella sp.
Astartella sp. Hall 1858 clam
 Nuculida - Nuculidae
Nuculopsis "sp. c"
Nuculopsis "sp. c" Girty 1912 nut clam