USGS 2461-PC, 2461A-PC (Carboniferous of the United States)

Also known as Sando et al. North Crazy Woman Creek Loc.52

Where: Johnson County, Wyoming (44.2° N, 106.9° W: paleocoordinates 4.0° N, 34.3° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Ranchester Member (Amsden Formation), Atokan (318.1 - 311.4 Ma)

• Chert bednear top of Amsden Fm. "Pennsylvanian (Atokan?)."

• 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 cherty 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 N.H. Darton, 1903. Fossils listed by Darton, 1906a, p.33-34, 1906b, p.5, 1906c, p.5, Branson, 1939, p.1201, and Burk, 1954, p.2-3."

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 5725: authorized by John Alroy, entered by Mike Sommers on 17.11.1999, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Proetida - Proetidae
? Paladin sp. Weller 1936 trilobite
Strophomenata
 Productida - Echinoconchidae
Juresania sp. Fredericks 1928
 Orthotetida - Pulsiidae
Rhynchonellata
 Spiriferida - Spiriferidae
Bivalvia
 Pectinida - Entoliidae
Pernopecten sp. Winchell 1865 scallop
 Pectinida - Pseudomonotidae
Pseudomonotis sp. von Beyrich 1862 scallop
 Carditida - Astartidae
Astartella concentrica Conrad 1842 clam
 Cardiida - Kalenteridae
Permophorus sp. Chavan 1954 clam
sp. A
 Pholadomyida - Edmondiidae
Edmondia sp. de Koninck 1841 clam
Gastropoda
 Euomphalina - Euomphalidae
"Straparollus (Euomphalus) aff. plummeri" = Euomphalus plummeri
"Straparollus (Euomphalus) aff. plummeri" = Euomphalus plummeri Knight 1934 snail
sgn. (Euomphalus)
 Prosobranchia - Goniasmatidae
? Goniasma sp. Tomlin 1930 snail
 Heterostropha - Donaldinidae
Donaldina sp. Knight 1933 snail
 Bellerophontida - Bellerophontidae
Bellerophon spp., "Bellerophon cf. crassus" = Waagenella crassus
Bellerophon spp. de Montfort 1808 snail
"Bellerophon cf. crassus" = Waagenella crassus Meek and Worthen 1860 snail
 Neritoidea - Naticopsidae
Colpites sp. Knight 1936 snail
sp. A
 Murchisoniina -
Murchisonioidea indet. Koken 1896 snail
 Pleurotomariida - Portlockiellidae
Shansiella sp. Yin 1932 snail
 Pleurotomariida - Phymatopleuridae
? Baylea sp. de Koninck 1881 snail
? Borestus sp. Thomas 1940 snail
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
bryozoan, gen. et sp. indet.