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
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
Bivalvia | |
Nuculopsis "sp. c" Girty 1912 nut clam | |
Astartella sp. Hall 1858 clam | |
Pseudopermophorus annettae Ciriacks 1963 clam |