Where: Montana (47.1° N, 109.4° W: paleocoordinates 17.6° N, 28.1° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Cherty Shale Member (Phosphoria Formation), Permian (298.9 - 251.9 Ma)

• member-level stratigraphic resolution

Environment/lithology: marine; cherty/siliceous shale

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: biostratigraphic analysis

PaleoDB collection 11274: authorized by Arnold Miller, entered by Chad Ferguson on 30.07.2001

Creative Commons license: CC BY (attribution)