Where: Grant County, New Mexico (32.8° N, 108.5° W: paleocoordinates 33.7° N, 72.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Neocardioceras juddii ammonoid zone, Colorado Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)

• Limestone concretions in shale member

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified shale

Size class: macrofossils

Collected by S.C. Hook, W.A. Cobban in 1981; 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 177136: authorized by Matthew Clapham, entered by Matthew Clapham on 19.03.2016

Creative Commons license: CC BY (attribution)