Also known as Sando et al. Horse Creek Loc.43

Where: Fremont County, Wyoming (43.7° N, 109.6° W: paleocoordinates 2.0° N, 39.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Anthracospirifer welleri - shawi zone, Horseshoe Member (Amsden Formation), Chesterian to Chesterian (335.5 - 321.8 Ma)

• Limestone and shale 89.1 ft above base of Amsden Fm. "Carlinia amsdeniana Subzone, Late Mississippian (Chesterian)."

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified, red, silty, sandy, calcareous shale and gypsiferous, shelly/skeletal limestone

Preservation: replaced with silica

Reposited in the UW

• "Collected by C.A. Biggs, 1950. Fossils listed by Burk, 1954, p.8, and Shaw, 1955, p.62, fig.1 and Keefer and Van Lieu, 1966, table 6. Collection appears to represent a mixture of fossils from Carlinia amsdeniana Subzone (whitish speckled limestone and yellowish limestone matrix) and Composita poposiensis Subzone (loose silicified specimens). It also includes a brachiopod from the Madison Limestone [not included in list]."

Primary reference: W. J. Sando, M., J.r. Gordon, and J. T. Dutro. 1975. Stratigraphy and geologic history of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming. United States Geological Survey Professional Paper 848A:1-83 [J. Alroy/M. Sommers/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 5717: authorized by John Alroy, entered by Mike Sommers on 17.11.1999

Creative Commons license: CC BY (attribution)