USGS 3843-PC (Carboniferous of the United States)

Also known as Sando et al. Rawlins US 287 Loc.6

Where: Carbon County, Wyoming (41.8° N, 107.2° W: paleocoordinates 2.4° N, 36.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Mesolobus zone, Ranchester Member (Amsden Formation), Atokan (318.6 - 312.8 Ma)

• group of beds-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 W.T. Lee, 1921. Fossils originally identified by G.H. Girty and listed in Lee, 1927, p.72; subsequently listed by Branson, 1939, p.1213 and Burk, 1954, p3."

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 5678: 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
Foraminifera
 Tetrataxoidea - Tetrataxidae
Tetrataxis sp.
Tetrataxis sp. Ehrenberg 1854
 Fusulinoidea - Eostaffellidae
Eostaffella sp., Millerella sp.
Eostaffella sp. Rauser-Chernousova 1948
 Fusulinoidea - Schubertellidae
Eoschubertella sp.
 Archaediscacea - Archaediscidae
Archaediscus sp., Asteroarchaediscus sp.
 Fusulinina - Pseudoammodiscidae
Pseudoglomospira sp.
Rhynchonellata
 Spiriferida - Spiriferidae
Anthracospirifer occidus
 Athyridida - Athyrididae
Composita subtilita
Strophomenata
 Strophomenida - Rugosochonetidae
Mesolobus sp.
Mesolobus sp. Dunbar and Condra 1932
 Productida - Productellidae
Antiquatonia cf. coloradoensis
 Productida - Echinoconchidae
Echinoconchus sp.
 Productida - Linoproductidae
Linoproductus planiventralis
 Orthotetida - Derbyiidae
Derbyia cf. robusta
Calcisphaera
  -
Calcisphaera pachysphaerica
Calcisphaera laevis
  -
Calcisphaera laevis
Calcisphaera laevis Williamson 1880