Also known as Horizon SM6, Sheep Mtn. Sect., DuNoir Limestone Fm., WY - Lochman and Hu 1960

Where: Sublette County, Wyoming (43.3° N, 109.8° W)

• Paleocoordinates: 34.0° N, 114.6° W (Wright 2013)

• local area-level geographic resolution

When: Middle Cedaria trilobite zone, DuNoir Formation, Dresbachian (497.0 - 486.9 Ma)

• The Open Door Formation underlies the Ordovician Bighorn dolomite Formation. Horizon is 94.5 feet below top of DuNoir limestone.

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, green limestone

Size class: macrofossils

Collection methods: Collected from 1938 to 1941 by the Texas Christian University Geology Department

Primary reference: C. Lochman and C. H. Hu. 1960. Upper Cambrian faunas from the northwest Wind River Mountains, Wyoming. Part 1. Journal of Paleontology 34(5):793-834 [M. Patzkowsky/P. Borkow/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 9054: authorized by Mark Patzkowsky, entered by Phil Borkow on 19.09.2000

Creative Commons license: CC0 (CC0)