Also known as M 38

Where: Bear Butte Creek County, South Dakota (44.3° N, 103.7° W: paleocoordinates 11.6° S, 83.0° W)

• small collection-level geographic resolution

When: Crepicephalus trilobite zone, lower Member (Deadwood Formation), Dresbachian (501.0 - 488.3 Ma)

• AGE: Dresbachian; refined by A. Hendy (6/2009) on the basis of biostratigraphic data (= Crepicephalus zone).

Environment/lithology: shoreface; lithology not reported

Collection methods: bulk,

Primary reference: J. H. Stitt and P.J. Perfetta. 2000. Trilobites, Biostratigraphy, and Lithostratigraphy of the Crepicephalus and Aphelaspis zones, Lower Deadwood formation (Marjuman and Steptoean Stages, Upper Cambrian), Black Hills, South Dakota. Journal of Paleontology 74(2):199-223 [M. Patzkowsky/K. Straub/J. Alroy] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 7186: authorized by Mark Patzkowsky, entered by Kyle Straub on 10.05.2000