USGS Loc. 21574, Garfield Co. [Bearpaw Shale] (Cretaceous of the United States)

Also known as Loc. 2 (of Kennedy et al. 2000)

Where: Garfield County, Montana (47.3° N, 107.0° W)

• Paleocoordinates: 56.5° N, 63.3° W (Wright 2013)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Didymoceras nebrascense ammonoid zone, Bearpaw Shale Formation, Late/Upper Campanian (83.6 - 72.2 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 about 20 m above base.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified shale

• ENVIRONMENT: Marine siliciclastic.
• SPECIFIC LITHOLOGY: Shale. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: mold/impression

Collected by Mueller in 1949; reposited in the USNM

Collection methods: surface (in situ),

• COLLECTOR: Mueller, 1949. REPOSITORY: USNM.

Primary reference: W. J. Kennedy, N. H. Landman, W. A. Cobban and G.R. Scott. 2000. Late Campanian (Cretaceous) heteromorph ammonites. Bulletin of the American Museum of Natural History 251:1-88 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 88463: authorized by Austin Hendy, entered by Austin Hendy on 12.04.2009

Creative Commons license: CC0 (CC0)

Taxonomic list

• COVERAGE: Limited to heteromorph ammonites, and other taxa from secondary publications. NOMENCLATURE: An authoritative publication, with modern nomenclature, and species-resolution identifications.
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Nostoceratidae
Didymoceras nebrascense
Didymoceras nebrascense Meek and Hayden 1856 ammonite