USGS 22204-PC: Morrowan, Wyoming

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Apterrinellidae indet.
Stacheiinae indet.
marine alga
Calcisphaera sp. Williamson 1880
Conodonta - Ozarkodinida - Idiognathodontidae
Streptognathodus parvus
Idiognathoides corrugata
Idiognathoides sinuata
Rhynchonellata - Athyridida - Athyrididae
Composita ovata Mather 1915
Rhynchonellata - Orthida - Schizophoriidae
Schizophoria aff. texana
Strophomenata - Productida - Productellidae
Antiquatonia cf. coloradoensis
Archaediscidae
Asteroarchaediscus bachkiricus
Neoarchaediscus ex gr. incertus
Neoarchaediscus ex gr. parvus
Archaediscus sp.
Planospirodiscus sp.
Endothyridae
Endothyra sp.
Zellerina discoidea
Tuberitinidae
Eotuberitina sp.
Pseudoammodiscidae
Pseudoglomospira sp.
Palaeotextulariidae
Palaeotextularia ex gr. consobrina
Palaeotextularia ex gr. longiseptata
Climacammina sp. Brady 1873
Biseriamminidae
Lipinella sp.
(nom. nud.)
Biseriella moderata
Biseriella sp.
Biseriella ex gr. parva (Chernysheva 1948)
Globivalvulina sp. Schubert 1921
Tetrataxidae
Tetrataxis sp. Ehrenberg 1854
Eostaffellidae
cf. Millerella sp.
Eostaffellina paraprotvae
Eostaffella sp. Rauser-Chernousova 1948
Tubothalamea - Miliolida - Cornuspiridae
Cornuspiridae indet. Schultze 1854
see common names

Geography
Country:United States State/province:Wyoming County:Sheridan
Coordinates: 44.9° North, 107.4° West (view map)
Paleocoordinates:4.5° North, 34.3° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Carboniferous Epoch:Pennsylvanian
Stage:Bashkirian 10 m.y. bin:Carboniferous 4
*Period:Late/Upper Carboniferous *Epoch:Bashkirian
*Local age/stage:Morrowan
Key time interval:Morrowan
Age range of interval:323.20000 - 318.40000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Amsden Member:Ranchester
Stratigraphic resolution:bed
Stratigraphy comments: Float from limestone about 100 ft above base of Amsden Fm. "Pennsylvanian (Morrowan)."
Lithology and environment
Primary lithology:lenticular,concretionary,gray,yellow lithified sandy,cherty/siliceous dolomite
Secondary lithology:green,red "shale"
Includes fossils?Y
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.J. Sando and K.R. Moore, 1965."
Metadata
Also known as:Sando et al. Amsden Creek Loc.68
Database number:5732
Authorizer:J. Alroy Enterer:M. Sommers
Modifier:C. Visaggi Research group:marine invertebrate
Created:1999-11-17 16:04:27 Last modified:2004-03-11 16:25:11
Access level:the public Released:1999-11-17 16:04:27
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]