Where: Custer County, South Dakota (43.7° N, 103.2° W: paleocoordinates 45.0° N, 66.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Carlile Shale Formation, Middle Turonian (93.5 - 89.3 Ma)

• Carlile Shale, lower part.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, concretionary shale

Size class: macrofossils

Collected by N.H. Darton in 1898; 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 176963: authorized by Matthew Clapham, entered by Matthew Clapham on 10.03.2016

Creative Commons license: CC BY (attribution)