Also known as Sando et al. Tweed Creek Loc.20
Where: Fremont County, Wyoming (42.6° N, 108.6° W: paleocoordinates 0.7° N, 39.5° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Anthracospirifer welleri-shawi zone, Horseshoe Member (Amsden Formation), Chesterian to Chesterian (339.4 - 314.6 Ma)
• Float from Amsden Fm. "Carlinia amsdeniana subzone? Late Mississippian (Chesterian)."
• bed-level stratigraphic resolution
Environment/lithology: offshore; lithified, red, silty, sandy, calcareous shale and gypsiferous, shelly/skeletal limestone
Reposited in the USGS
• "Collected by C.C. Branson, 1939."
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 5686: authorized by John Alroy, entered by Mike Sommers on 15.11.1999
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
? Cypricardella sp. Hall 1856 clam | |
Schizodus cf. depressus Worthen 1884 clam |