Where: Natrona County, Wyoming (42.9° N, 106.6° W: paleocoordinates 43.0° N, 67.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Dunveganoceras problematicum ammonoid zone, Frontier Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)

• Frontier Formation, from a lenticular bed of conglomerate in the upper part.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified conglomerate

Size class: macrofossils

Collected by E.A. Merewether, W.A. Cobban in 1974; reposited in the USNM

Primary reference: W. A. Cobban. 1988. Tarrantoceras Stephenson and related ammonoid genera from Cenomanian (Upper Cretaceous) rocks in Texas and the western interior of the United States. United States Geological Survey Professional Paper 1473:1-30 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 177118: authorized by Matthew Clapham, entered by Matthew Clapham on 19.03.2016

Creative Commons license: CC BY (attribution)