Where: Valley County, Montana (48.6° N, 106.9° W: paleocoordinates 55.0° N, 72.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Didymoceras nebrascense ammonoid zone, Bearpaw Shale Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• STRATIGRAPHIC RELATIONS: From the Bearpaw Shale, for which lithostratigraphic relations are not discussed. AGE: Late Campanian, on the basis of ammonoid biostratigraphy; Didymoceras nebrascense zone. STRATIGRAPHIC POSITION: From unknown position within formation.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified shale

Size class: macrofossils

Preservation: mold/impression

Collected by Jensen in 1950; reposited in the USNM

Collection methods: surface (in situ),

• COLLECTOR: Jensen, 1950. REPOSITORY: 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 88462: authorized by Austin Hendy, entered by Austin Hendy on 12.04.2009, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)