Where: Navajo County, Arizona (36.6° N, 110.5° W: paleocoordinates 37.8° N, 73.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Mancos Shale Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, concretionary shale

Size class: macrofossils

Collected by W.A. Cobban in 1969; reposited in the USNM

Primary reference: W. A. Cobban. 1972. New and little-known ammonites from the Upper Cretaceous (Cenomanian and Turonian) of the western interior of the United States. United States Geological Survey Professional Paper 699:1-24 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 176939: authorized by Matthew Clapham, entered by Matthew Clapham on 09.03.2016

Creative Commons license: CC BY (attribution)