USGS 11112-PC, 19187-PC (Carboniferous of the United States)

Also known as Sando et al. Trout Creek Loc.50

Where: Washakie County, Wyoming (43.5° N, 107.5° W: paleocoordinates 3.5° N, 35.3° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Dolomite within about 50 ft of base of Tensleep Sandstone. "Pennsylvanian (Morrowan?)."

• bed-level stratigraphic resolution

Environment/lithology: offshore shelf; lithified, lenticular, concretionary, gray, yellow, sandy, cherty/siliceous dolomite and green, red shale

• ranchester: heterogenous sequence of interbedded chery dolomite and limestone, sandstone, and shale. carbonate rocks predominate; thin- to thick-bedded, fine grained to coarsely crystalling, yellowish-gray weathering dolomite and dolomitic limestone are generally much more abundant than thin-bedded, fine- to medium-grained, light-gray to purple weathering limestone. carbonate beds, particularly dolomites, contain abundant gray, brown or jasperoid chert in small nodules, irregular lenses and irregular networks. red and green shale in thin beds and partings are commonly interbedded with the carbonate rocks, particularly in the upper half, and may compose significant thicknesses of the member at some localities. thin beds of fine- to medium-grained, white to pink sandstone occur throughout the member but are most abundant in the upper half. quartz sand is also a minor constituent of some of the carbonate beds. anhydrite was reported as a minor constituent of some dolomite beds.

Reposited in the USGS

• "Collected by H.A. Tourtelot, 1947. Fossils listed by Tourtelot, 1953, table 2."

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 5724: authorized by John Alroy, entered by Mike Sommers on 17.11.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

 Earlandiacea - Pseudoammodiscidae
 Earlandiacea - Earlandiidae
 Palaeotextularoidea - Biseriamminidae
 Proetida - Proetidae
Paladin sp. Weller 1936 trilobite
 Pectinida - Aviculopectinidae
Aviculopecten sp. M'Coy 1851 scallop
sp. B
 Ostreida - Pterineidae
Leptodesma sp. Hall 1883 oyster
 Carditida - Astartidae
Astartella concentrica Conrad 1842 clam
 Cardiidia - Sanguinolitidae
Wilkingia terminalis Hall 1852 clam
 Pholadomyida - Edmondiidae
Edmondia spp. de Koninck 1841 clam
 Trigoniida - Schizodidae
Schizodus aff. affinis Herrick 1887 clam
 Nuculida - Nuculidae
Nuculopsis sp. Girty 1912 nut clam
sp. B
 Protobranchia - Sareptidae
 Protobranchia - Nuculanidae
Phestia sp. Chernyshev 1951 pointed nut clam
 Euomphalina - Euomphalidae
"Straparollus (Euomphalus) aff. plummeri" = Euomphalus plummeri
"Straparollus (Euomphalus) aff. plummeri" = Euomphalus plummeri Knight 1934 snail
sgn. (Euomphalus)
 Prosobranchia - Meekospiridae
Girtyspira sp. Knight 1936 snail
sp. B
? Meekospira sp. Ulrich and Scofield 1897 snail
 Prosobranchia - Orthonematidae
Orthonema sp. Meek and Worthen 1862 snail
 Bellerophontida - Bellerophontidae
"Knightites (Retispira) sp." = Retispira
"Knightites (Retispira) sp." = Retispira Knight 1945 snail
sgn. (Retispira) sp. B
 Neritoidea - Naticopsidae
Naticopsis (Naticopsis) spp. M'Coy 1844 snail
sgn. (Naticopsis)
Colpites sp. Knight 1936 snail
sp. A
 Murchisoniina - Soleniscidae
? Soleniscus sp. Meek and Worthen 1860 snail
 Trochoidea - Araeonematidae
? Yunnania sp. Mansuy 1912 snail
 Miliolida - Cornuspiridae
Cornuspiridae indet. Schultze 1854