USGS 3843-PC: Atokan, Wyoming

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Tetrataxidae
Tetrataxis sp. Ehrenberg 1854
Eostaffellidae
Eostaffella sp. Rauser-Chernousova 1948
Millerella sp.
Schubertellidae
Eoschubertella sp.
Archaediscidae
Archaediscus sp.
Asteroarchaediscus sp.
Pseudoammodiscidae
Pseudoglomospira sp.
Rhynchonellata - Spiriferida - Spiriferidae
Anthracospirifer occidus
Rhynchonellata - Athyridida - Athyrididae
Composita subtilita (Hall 1852)
Strophomenata - Strophomenida - Rugosochonetidae
Mesolobus sp. Dunbar and Condra 1932
Strophomenata - Productida - Productellidae
Antiquatonia cf. coloradoensis
Strophomenata - Productida - Echinoconchidae
Echinoconchus sp.
sp. A
Strophomenata - Productida - Linoproductidae
Linoproductus planiventralis Hoare 1960
Strophomenata - Orthotetida - Derbyiidae
Derbyia cf. robusta
unclassified
Calcisphaera pachysphaerica
Calcisphaera laevis Williamson 1880
see common names

Geography
Country:United States State/province:Wyoming County:Carbon
Coordinates: 41.8° North, 107.2° West (view map)
Paleocoordinates:2.4° North, 36.0° West
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period:Carboniferous Epoch:Pennsylvanian
10 m.y. bin:Carboniferous 4
*Period:Late/Upper Carboniferous *Epoch:Moscovian
*Local age/stage:Atokan
Key time interval:Atokan Zone: Mesolobus
Age range of interval:318.40000 - 312.70000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Amsden Member:Ranchester
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology:lenticular,concretionary,gray,yellow lithified sandy,cherty/siliceous dolomite
Secondary lithology:green,red "shale"
Lithology description: 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.
Environment:offshore shelf Tectonic setting:cratonic basin
Taphonomy
Modes of preservation:body
Collection methods and comments
Collection methods:field collection,survey of museum collection
Reason for describing collection:biostratigraphic analysis
Museum repositories:USGS
Collection method comments: "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."
Metadata
Also known as:Sando et al. Rawlins US 287 Loc.6
Database number:5678
Authorizer:J. Alroy Enterer:M. Sommers
Modifier:C. Visaggi Research group:marine invertebrate
Created:1999-11-15 13:53:19 Last modified:2004-03-11 16:25:11
Access level:the public Released:1999-11-15 13:53:19
Creative Commons license:CC BY
Reference information

Primary reference:
349. 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]