USGS 19283-PC (Carboniferous to of the United States)

Also known as Sando et al. Cherry Creek Loc.27

Where: Fremont County, Wyoming (42.6° N, 108.7° W: paleocoordinates 0.8° 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 (335.5 - 321.8 Ma)

• Float from Horseshoe Member. "Carlinia amsdeniana subzone. Late Mississippian (Chesterian)."

• bed-level stratigraphic resolution

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

• horseshoe: predominantly fissile, platy or blocky siltstone, shale, and mudstone. weathers bright red to grayish red or purple. thin beds and lenses of platy, white to red, fine grained, commonly calcareous quartz sandstone occur sporadically throughout member. thin beds of silty, sandy, or argillaceous limestone are rare in central wy, significant proportion in western wy. dolomite is a rare constituent. limestone beds are either fine grained and unfossiliferous or fine to medium grained and contain a shelly fauna. anhydrite and gypsum present at several localities. represents offshore marine facies of the transgressing amsden sea.

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 5693: authorized by John Alroy, entered by Mike Sommers on 15.11.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Anthozoa
 Stauriida - Hapsiphyllidae
Barytichisma amsdenense
Rhynchonellata
 Athyridida - Athyrididae
Composita sigma, Cleiothyridina hirsuta
Composita sigma Gordon 1975
Cleiothyridina hirsuta Hall 1857
ssp. darwinensis
 Athyridida - Retziidae
Eumetria sulcata
 Spiriferida - Spiriferidae
Anthracospirifer welleri
 Spiriferida - Choristitidae
Brachythyrina washakiensis
 Spiriferinida - Reticulariinidae
Reticulariina browni
Strophomenata
 Productida - Monticuliferidae
Ovatia croneisi
 Orthotetida - Meekellidae
Orthothetina amsdenensis
Orthothetina amsdenensis
[entered as Orthotetina amsdenensis]
 Orthotetida - Orthotetidae
Orthotetes kaskaskiensis
Orthotetes kaskaskiensis McChesney 1860
ssp. bransonorum
Bivalvia
 Nuculanida - Sareptidae
Paleyoldia amsdenensis