Where: Montana (47.1° N, 109.4° W)

• Paleocoordinates: 28.0° N, 26.6° W (Wright 2013)

• coordinate based on political unit

• basin-level geographic resolution

When: Rex Chert Member (Phosphoria Formation), Wuchiapingian (259.9 - 254.2 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.

• member-level stratigraphic resolution

Environment/lithology: marine; chert and limestone

Size class: macrofossils

Primary reference: E. L. Yochelson and D. H. Van Sickle. 1968. Biostratigraphy of the Phosphoria, Park City, and Shedhorn Formations; Geology of Permian Rocks in the Western Phosphate Field. United States Geological Survey Professional Paper 313(D):572-660 [A. Miller/C. Ferguson/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 11278: authorized by Arnold Miller, entered by Chad Ferguson on 30.07.2001

Creative Commons license: CC0 (CC0)