Upper Member, Shedhorn Formation of Montana: Wordian, Montana

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Scapallina phosphoriensis
Porifera indet. Grant 1836
Stenolaemata - Trepostomata
Trepostomata indet. Ulrich 1882
entered as "Terpostomata"
Lingulata - Lingulida - Lingulidae
Lingula sp. Bruguiére 1797
Rhynchonellata - Athyridida - Athyrididae
Composita sp. Brown 1849
Rhynchonellata - Rhynchonellida - Wellerellidae
Wellerella sp. Dunbar and Condra 1932
Strophomenata - Strophomenida - Chonetidae
Strophomenata - Productida - Productellidae
aff. Echinauris sp. Muir-Wood and Cooper 1960
Strophomenata - Orthotetida - Derbyiidae
Derbyia sp. Waagen 1884
Scaphopoda - Dentaliida - Prodentaliidae
Plagioglypta canna (White 1874)
recombined as Prodentalium canna
Scaphopoda - Dentaliida - Dentaliidae
Plagioglypta sp. Pilsbry 1898
Bivalvia - Pectinida - Deltopectinidae
Aviculopecten cf. alternatus Branson 1930
synonym of Cyrtorostra varicostata
Bivalvia - Pectinida - Aviculopectinidae
Aviculopecten sp. M'Coy 1851
Bivalvia - Pectinida - Limipectinidae
Acanthopecten sp. Girty 1903
Bivalvia - Trigoniida - Costatoriidae
Costatoria sexradiata (Branson 1930)
recombined as Procostatoria sexradiata
Bivalvia - Trigoniida - Schizodidae
Schizodus sp. King 1844
Schizodus cf. bifidus Ciriacks 1963
Bivalvia - Cardiida - Kalenteridae
Pseudopermophorus annettae Ciriacks 1963
Bivalvia - Nuculida - Nuculidae
Nuculopsis poposiensis (Branson 1930)
Gastropoda - Bellerophontida
Bellerophon sp. de Montfort 1808
    = Bellerophontoidea indet. M'Coy 1851
Wagner 2023
Gastropoda - Bellerophontida - Bellerophontidae
Bellerophon deflectus Chronic 1952
Gastropoda - Bellerophontida - Euphemitidae
Euphemitopsis cf. paucinodosus (Yochelson 1960)
Euphemitopsis subpapillosus (White 1876)
recombined as Euphemitopsis subpapillosa
Warthia sp. Waagen 1880
Euphemites sp. Warthin 1930
Osteichthyes
Osteichthyes indet. Huxley 1880
see common names

Geography
Country:United States State/province:Montana
Coordinates: 47.1° North, 109.4° West (view map)
Paleocoordinates:18.4° North, 28.4° West
Basis of coordinate:based on political unit
Geographic resolution:basin
Time
Period:Permian Epoch:Guadalupian
Stage:Wordian 10 m.y. bin:Permian 4
Key time interval:Wordian
Age range of interval:266.90000 - 264.28000 m.y. ago
Stratigraphy
Formation:Shedhorn Member:Upper
Stratigraphic resolution:member
Lithology and environment
Primary lithology: sandstone
Includes fossils?Y
Environment:marine indet.
Taphonomy
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:11276
Authorizer:A. Miller, P. Wagner Enterer:C. Ferguson, P. Wagner
Modifier:C. Ferguson Research group:marine invertebrate
Created:2001-07-30 11:10:02 Last modified:2006-07-13 15:30:48
Access level:the public Released:2001-07-30 11:10:02
Creative Commons license:CC BY
Reference information

Primary reference:
4145.1% 17920E. L. Yochelson and D. H. Van Sickle. 1968. Biostratigraphy of the Phosphoria, Park City, and Shedhorn Formations; Geology of Permian Rocks in the Western Phosphate Field. United States Geological Survey Professional Paper 313(D):572-660 [A. Miller/C. Ferguson/P. Wagner]

Secondary references:

9042 P. J. Wagner. 2023. Paleozoic Gastropod, Rostroconch, Helcionelloid and Tergomyan Database (2006 - 2023). [P. Wagner/P. Wagner/P. Wagner]