USGS 21728-PC (Carboniferous of the United States)

Also known as Sando et al. Meadow Ranch Loc.8

Where: Carbon County, Wyoming (41.8° N, 107.3° W: paleocoordinates 2.2° N, 36.3° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Horseshoe Member (Amsden Formation), Morrowan (318.1 - 314.6 Ma)

• Limestone bed 46-46.5 ft above base of Amsden Fm.

• group of beds-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 W.J. Sando and K.R. Moore, 1964."

Primary reference: W. J. Sando, M. Gordon, Jr., 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/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 5680: authorized by John Alroy, entered by Mike Sommers on 15.11.1999, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

 Orthotetida -
Orthotetida indet. Waagen 1884
orthotetoid gen. et sp. indet.
 Bellerophontida - Bellerophontidae
"Bellerophon cf. crassus" = Waagenella crassus
"Bellerophon cf. crassus" = Waagenella crassus Meek and Worthen 1860 snail