Where: Petroleum County, Montana (46.9° N, 108.5° W: paleocoordinates 47.2° N, 67.3° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Metoicoceras mosbyense ammonoid zone, Mosby Sandstone Member (Belle Fourche Formation), Late/Upper Cenomanian (99.6 - 93.5 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified sandstone

Size class: macrofossils

Preservation: concretion

Collected by O.O. Mueller in 1948; reposited in the USNM

Primary reference: W. A. Cobban. 1953. Cenomanian ammonite fauna from the Mosby Sandstone of central Montana. United States Geological Survey Professional Paper 243-D:45-55 [M. Clapham/K. Okamoto/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 167812: authorized by Matthew Clapham, entered by Matthew Clapham on 03.04.2015

Creative Commons license: CC BY (attribution)