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Amsden - Horseshoe, Wyoming, USA

Formation	Amsden
Member	Horseshoe
Age:	318 - 315 Ma Carboniferous
Interval	Morrowan
Tectonic Setting	Cratonic basin
Lithology	shale/"limestone", "shale"
Number of Collections	38
Number of Occurrences	354

Recorded Sample Locations

Location	Region	Stratigraphic Name
USGS 5441-PC	Carbon County, Wyoming, USA	Amsden - Horseshoe
USGS 3140-PC	Carbon County, Wyoming, USA	Amsden - Horseshoe
USGS 21727-PC	Carbon County, Wyoming, USA	Amsden - Horseshoe
UW 2997/6A	Fremont County, Wyoming, USA	Amsden - Horseshoe
USGS 19285-PC	Fremont County, Wyoming, USA	Amsden - Horseshoe
UW 3099/9B	Fremont County, Wyoming, USA	Amsden - Horseshoe
UM Collections	Fremont County, Wyoming, USA	Amsden - Horseshoe
USGS 19283-PC	Fremont County, Wyoming, USA	Amsden - Horseshoe
UW 3199/19B2	Fremont County, Wyoming, USA	Amsden - Horseshoe
USGS 14025-PC	Fremont County, Wyoming, USA	Amsden - Horseshoe
USGS 19156-PC	Teton County, Wyoming, USA	Amsden - Horseshoe
UW 43106/19A	Fremont County, Wyoming, USA	Amsden - Horseshoe
USGS 21719-PC	Fremont County, Wyoming, USA	Amsden - Horseshoe
USGS 16197-PC	Fremont County, Wyoming, USA	Amsden - Horseshoe
USGS 16216-PC	Carbon County, Wyoming, USA	Amsden - Horseshoe
USGS 24050-PC. SW¼ sec. 26 T47N R116W Teton County	Johnson County, Wyoming, USA	Amsden - Horseshoe

Associated Units

Stratigraphic Name	Age	Lithology	Occurrence Records
Amsden - Ranchester	318 - 299 Ma Carboniferous	dolomite/"shale"	268

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Cornuspira sp. genus	6	Chromista : Foraminifera : Tubothalamea : Miliolida : Cornuspiridae : *Cornuspira*	318.1 - 314.6 Ma Carboniferous
Calcisphaera sp. genus	6	*Calcisphaera*	318.1 - 314.6 Ma Carboniferous
Amphissites sp. genus	6	Animalia : Arthropoda : Ostracoda : Palaeocopida : Amphissitidae : *Amphissites*	339.4 - 314.6 Ma Carboniferous
Ectodemites sp. genus	6	Animalia : Arthropoda : Ostracoda : Palaeocopida : *Ectodemites*	339.4 - 314.6 Ma Carboniferous
Glyptopleura sp. genus	6	Animalia : Arthropoda : Ostracoda : Palaeocopida : Glyptopleuridae : *Glyptopleura*	339.4 - 314.6 Ma Carboniferous
Balantoides sp. genus	6	Animalia : Arthropoda : Ostracoda : Palaeocopida : Aechminellidae : *Balantoides*	339.4 - 314.6 Ma Carboniferous
Sansabella sp. genus	6	Animalia : Arthropoda : Ostracoda : Palaeocopida : *Sansabella*	339.4 - 314.6 Ma Carboniferous
Cavellina sp. genus	6	Animalia : Arthropoda : Ostracoda : Podocopida : Cavellinidae : *Cavellina*	339.4 - 314.6 Ma Carboniferous
Hollinella sp. genus	6	Animalia : Arthropoda : Ostracoda : Platycopida : Hollinellidae : *Hollinella*	339.4 - 314.6 Ma Carboniferous
Sargentina sp. genus	6	Animalia : Arthropoda : Ostracoda : Platycopida : Knoxitidae : *Sargentina*	339.4 - 314.6 Ma Carboniferous
Shishaella sp. genus	6	Animalia : Arthropoda : Ostracoda : Podocopida : *Shishaella*	339.4 - 314.6 Ma Carboniferous
Acratia sp. genus	6	Animalia : Arthropoda : Ostracoda : Podocopida : Acratiidae : *Acratia*	339.4 - 314.6 Ma Carboniferous
Bairdia sp. genus	6	Animalia : Arthropoda : Ostracoda : Podocopida : Bairdiidae : *Bairdia*	339.4 - 314.6 Ma Carboniferous
Pseudobythocypris sp. genus	6	Animalia : Arthropoda : Ostracoda : Podocopida : Bairdiocyprididae : *Pseudobythocypris*	339.4 - 314.6 Ma Carboniferous
Healdia sp. genus	6	Animalia : Arthropoda : Ostracoda : Podocopida : Healdiidae : *Healdia*	339.4 - 314.6 Ma Carboniferous
Paladin sp. genus	6	Animalia : Arthropoda : Trilobita : Proetida : Proetidae : *Paladin*	318.1 - 314.6 Ma Carboniferous
Orbiculoidea sp. genus	6	Animalia : Brachiopoda : Lingulata : Lingulida : Discinidae : *Orbiculoidea*	318.1 - 314.6 Ma Carboniferous
Orbiculoidea wyomingensis species	7	Animalia : Brachiopoda : Lingulata : Lingulida : Discinidae : Orbiculoidea : *Orbiculoidea wyomingensis*	339.4 - 314.6 Ma Carboniferous
Lingula carbonaria species	7	Animalia : Brachiopoda : Lingulata : Lingulida : Lingulidae : Lingula : *Lingula carbonaria*	339.4 - 314.6 Ma Carboniferous
Cleiothyridina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Athyrididae : *Cleiothyridina*	318.1 - 314.6 Ma Carboniferous
Composita sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Athyrididae : *Composita*	339.4 - 314.6 Ma Carboniferous
Composita elongata species	7	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Athyrididae : Composita : *Composita elongata*	318.1 - 314.6 Ma Carboniferous
Composita ovata species	7	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Athyrididae : Composita : *Composita ovata*	318.1 - 314.6 Ma Carboniferous
Composita sigma species	7	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Athyrididae : Composita : *Composita sigma*	339.4 - 314.6 Ma Carboniferous
Composita subquadrata species	7	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Athyrididae : Composita : *Composita subquadrata*	339.4 - 314.6 Ma Carboniferous
Eumetria sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Retziidae : *Eumetria*	339.4 - 314.6 Ma Carboniferous
Schizophoria sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Schizophoriidae : *Schizophoria*	339.4 - 314.6 Ma Carboniferous
Schizophoria depressa species	7	Animalia : Brachiopoda : Rhynchonellata : Orthida : Schizophoriidae : Schizophoria : *Schizophoria depressa*	339.4 - 318.1 Ma Carboniferous
Pugnoides sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida : Petasmariidae : *Pugnoides*	339.4 - 314.6 Ma Carboniferous
Pugnoides quinqueplecis species	7	Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida : Petasmariidae : Pugnoides : *Pugnoides quinqueplecis*	339.4 - 314.6 Ma Carboniferous
Brachythyrina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Choristitidae : *Brachythyrina*	339.4 - 314.6 Ma Carboniferous
Torynifer sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Elythidae : *Torynifer*	339.4 - 314.6 Ma Carboniferous
Anthracospirifer sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Spiriferidae : *Anthracospirifer*	318.1 - 314.6 Ma Carboniferous
Anthracospirifer occiduus species	7	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Spiriferidae : Anthracospirifer : *Anthracospirifer occiduus*	318.1 - 314.6 Ma Carboniferous
Anthracospirifer shawi species	7	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Spiriferidae : Anthracospirifer : *Anthracospirifer shawi*	339.4 - 314.6 Ma Carboniferous
Reticulariina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferinida : Reticulariinidae : *Reticulariina*	339.4 - 314.6 Ma Carboniferous
Girtyella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Terebratulida : Cranaenidae : *Girtyella*	339.4 - 314.6 Ma Carboniferous
Orthotetida order	4	Animalia : Brachiopoda : Strophomenata : Orthotetida	318.1 - 314.6 Ma Carboniferous
Derbyia sp. genus	6	Animalia : Brachiopoda : Strophomenata : Orthotetida : Derbyiidae : *Derbyia*	318.1 - 314.6 Ma Carboniferous
Orthothetina sp. genus	6	Animalia : Brachiopoda : Strophomenata : Orthotetida : Meekellidae : *Orthothetina*	339.4 - 314.6 Ma Carboniferous
Orthotetes kaskaskiensis species	7	Animalia : Brachiopoda : Strophomenata : Orthotetida : Orthotetidae : Orthotetes : *Orthotetes kaskaskiensis*	339.4 - 314.6 Ma Carboniferous
Schuchertella sp. genus	6	Animalia : Brachiopoda : Strophomenata : Orthotetida : Schuchertellidae : *Schuchertella*	339.4 - 314.6 Ma Carboniferous
Echinoconchus sp. genus	6	Animalia : Brachiopoda : Strophomenata : Productida : Echinoconchidae : *Echinoconchus*	318.1 - 314.6 Ma Carboniferous
Linoproductus sp. genus	6	Animalia : Brachiopoda : Strophomenata : Productida : Linoproductidae : *Linoproductus*	318.1 - 314.6 Ma Carboniferous
Linoproductus planiventralis species	7	Animalia : Brachiopoda : Strophomenata : Productida : Linoproductidae : Linoproductus : *Linoproductus planiventralis*	318.1 - 314.6 Ma Carboniferous
Ovatia sp. genus	6	Animalia : Brachiopoda : Strophomenata : Productida : Monticuliferidae : *Ovatia*	339.4 - 314.6 Ma Carboniferous
Antiquatonia sp. genus	6	Animalia : Brachiopoda : Strophomenata : Productida : Productidae : *Antiquatonia*	318.1 - 314.6 Ma Carboniferous
Carlinia sp. genus	6	Animalia : Brachiopoda : Strophomenata : Productida : Productidae : *Carlinia*	339.4 - 314.6 Ma Carboniferous
Diaphragmus nivosus species	7	Animalia : Brachiopoda : Strophomenata : Productida : Productidae : Diaphragmus : *Diaphragmus nivosus*	339.4 - 318.1 Ma Carboniferous
Flexaria sp. genus	6	Animalia : Brachiopoda : Strophomenata : Productida : Productidae : *Flexaria*	339.4 - 314.6 Ma Carboniferous
Inflatia sp. genus	6	Animalia : Brachiopoda : Strophomenata : Productida : Productidae : *Inflatia*	339.4 - 314.6 Ma Carboniferous
Strophomenida order	4	Animalia : Brachiopoda : Strophomenata : Strophomenida	339.4 - 314.6 Ma Carboniferous
Amplexus sp. genus	6	Animalia : Cnidaria : Anthozoa : Amplexidae : *Amplexus*	339.4 - 318.1 Ma Carboniferous
Neokoninckophyllum sp. genus	6	Animalia : Cnidaria : Anthozoa : Aulophyllidae : *Neokoninckophyllum*	318.1 - 314.6 Ma Carboniferous
Barytichisma sp. genus	6	Animalia : Cnidaria : Anthozoa : Hapsiphyllidae : *Barytichisma*	339.4 - 314.6 Ma Carboniferous
Zaphrentites sp. genus	6	Animalia : Cnidaria : Anthozoa : Hapsiphyllidae : *Zaphrentites*	339.4 - 314.6 Ma Carboniferous
Archaeocidaris sp. genus	6	Animalia : Echinodermata : Echinoidea : Archaeocidaridae : *Archaeocidaris*	318.1 - 314.6 Ma Carboniferous
Bivalvia class	3	Animalia : Mollusca : Bivalvia	339.4 - 314.6 Ma Carboniferous
Permophorus sp. genus	6	Animalia : Mollusca : Bivalvia : Venerida : Kalenteridae : *Permophorus*	318.1 - 314.6 Ma Carboniferous
Astartella sp. genus	6	Animalia : Mollusca : Bivalvia : Carditida : Astartidae : *Astartella*	339.4 - 318.1 Ma Carboniferous
Astartella concentrica species	7	Animalia : Mollusca : Bivalvia : Carditida : Astartidae : Astartella : *Astartella concentrica*	318.1 - 314.6 Ma Carboniferous
Cypricardella sp. genus	6	Animalia : Mollusca : Bivalvia : Carditida : Astartidae : *Cypricardella*	339.4 - 314.6 Ma Carboniferous
Myalina (Myalina) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Myalinida : Myalinidae : Myalina : *Myalina (Myalina)*	318.1 - 314.6 Ma Carboniferous
Sanguinolites sp. genus	6	Animalia : Mollusca : Bivalvia : Grammysiidae : *Sanguinolites*	339.4 - 314.6 Ma Carboniferous
Wilkingia terminalis species	7	Animalia : Mollusca : Bivalvia : Sanguinolitidae : Wilkingia : *Wilkingia terminalis*	318.1 - 314.6 Ma Carboniferous
Paleyoldia sp. genus	6	Animalia : Mollusca : Bivalvia : Nuculanida : Nuculanidae : *Paleyoldia*	339.4 - 314.6 Ma Carboniferous
Posidonia sp. genus	6	Animalia : Mollusca : Bivalvia : *Posidonia*	339.4 - 314.6 Ma Carboniferous
Caneyella sp. genus	6	Animalia : Mollusca : Bivalvia : Ostreida : Pterineidae : *Caneyella*	339.4 - 314.6 Ma Carboniferous
Leptodesma sp. genus	6	Animalia : Mollusca : Bivalvia : Ostreida : Pterineidae : *Leptodesma*	339.4 - 314.6 Ma Carboniferous
Aviculopecten sp. genus	6	Animalia : Mollusca : Bivalvia : Myalinida : Myalinidae : *Aviculopecten*	318.1 - 314.6 Ma Carboniferous
Schizodus sp. genus	6	Animalia : Mollusca : Bivalvia : Trigoniida : Schizodidae : *Schizodus*	318.1 - 314.6 Ma Carboniferous
Schizodus depressus species	7	Animalia : Mollusca : Bivalvia : Trigoniida : Schizodidae : Schizodus : *Schizodus depressus*	339.4 - 314.6 Ma Carboniferous
Bellerophon sp. genus	6	Animalia : Mollusca : Gastropoda : Bellerophontidae : *Bellerophon*	339.4 - 314.6 Ma Carboniferous
Retispira sp. genus	6	Animalia : Mollusca : Gastropoda : Bellerophontidae : *Retispira*	339.4 - 314.6 Ma Carboniferous
Bellerophon tenuilineata species	7	Animalia : Mollusca : Gastropoda : Bellerophontidae : Bellerophon : *Bellerophon tenuilineata*	326.4 - 318.1 Ma Carboniferous
Bellerophon crassus species	7	Animalia : Mollusca : Gastropoda : Bellerophontidae : Waagenella : *Bellerophon crassus*	318.1 - 314.6 Ma Carboniferous
Euphemites sacajawensis species	7	Animalia : Mollusca : Gastropoda : Euphemitidae : Euphemites : *Euphemites sacajawensis*	326.4 - 318.1 Ma Carboniferous
Amphiscapha calix species	7	Animalia : Mollusca : Gastropoda : Euomphalina : Euomphalidae : Amphiscapha : *Amphiscapha calix*	326.4 - 318.1 Ma Carboniferous
Straparollus plummeri species	7	Animalia : Mollusca : Gastropoda : Euomphalidae : Euomphalus : *Straparollus plummeri*	318.1 - 314.6 Ma Carboniferous
Strophostylus sp. genus	6	Animalia : Mollusca : Gastropoda : Platyceratidae : *Strophostylus*	326.4 - 318.1 Ma Carboniferous
Solenospira pygmaea species	7	Animalia : Mollusca : Gastropoda : Streptacididae : Donaldina : *Solenospira pygmaea*	326.4 - 318.1 Ma Carboniferous
Dictyotomaria carlbransoni species	7	Animalia : Mollusca : Gastropoda : Pleurotomariida : Gosseletinidae : Dictyotomaria : *Dictyotomaria carlbransoni*	326.4 - 318.1 Ma Carboniferous
Gosseletina sp. genus	6	Animalia : Mollusca : Gastropoda : Pleurotomariida : Gosseletinidae : *Gosseletina*	339.4 - 314.6 Ma Carboniferous
Ianthinopsis sp. genus	6	Animalia : Mollusca : Gastropoda : Soleniscidae : *Ianthinopsis*	339.4 - 314.6 Ma Carboniferous
Girtyspira sp. genus	6	Animalia : Mollusca : Gastropoda : Acteoninidae : *Girtyspira*	326.4 - 318.1 Ma Carboniferous
Naticopsis sp. genus	6	Animalia : Mollusca : Gastropoda : Cycloneritida : Naticopsidae : *Naticopsis*	339.4 - 314.6 Ma Carboniferous
Naticopsis (Naticopsis) sp. subgenus	6.3	Animalia : Mollusca : Gastropoda : Naticopsidae : Naticopsis : *Naticopsis (Naticopsis)*	339.4 - 314.6 Ma Carboniferous
Pseudozygopleura sp. genus	6	Animalia : Mollusca : Gastropoda : Pseudozygopleuridae : *Pseudozygopleura*	318.1 - 314.6 Ma Carboniferous
Chaetetes sp. genus	6	Animalia : Porifera : Chaetetidae : *Chaetetes*	339.4 - 314.6 Ma Carboniferous
Girvanella sp. genus	6	Bacteria : Cyanobacteria : Cyanophyceae : Porostromataceae : *Girvanella*	318.1 - 314.6 Ma Carboniferous
Archaediscus sp. genus	6	Chromista : Foraminifera : Globothalamea : Textulariida : Archaediscidae : *Archaediscus*	318.1 - 314.6 Ma Carboniferous
Asteroarchaediscus sp. genus	6	Chromista : Foraminifera : Globothalamea : Textulariida : Archaediscidae : *Asteroarchaediscus*	318.1 - 314.6 Ma Carboniferous
Neoarchaediscus sp. genus	6	Chromista : Foraminifera : Globothalamea : Textulariida : Archaediscidae : *Neoarchaediscus*	318.1 - 314.6 Ma Carboniferous
Planospirodiscus sp. genus	6	Chromista : Foraminifera : Globothalamea : Textulariida : Archaediscidae : *Planospirodiscus*	318.1 - 314.6 Ma Carboniferous
Diplosphaerina sp. genus	6	Chromista : Foraminifera : Tubothalamea : Tuberitinidae : *Diplosphaerina*	318.1 - 314.6 Ma Carboniferous
Biseriella sp. genus	6	Chromista : Foraminifera : Globothalamea : Textulariida : Biseriamminidae : *Biseriella*	318.1 - 314.6 Ma Carboniferous
Biseriella parva species	7	Chromista : Foraminifera : Globivalvulinidae : Biseriella : *Biseriella parva*	339.4 - 314.6 Ma Carboniferous
Globivalvulina sp. genus	6	Chromista : Foraminifera : Globivalvulinidae : *Globivalvulina*	318.1 - 314.6 Ma Carboniferous
Lipinella sp. genus	6	Chromista : Foraminifera : Globothalamea : Textulariida : Biseriamminidae : *Lipinella*	318.1 - 314.6 Ma Carboniferous
Earlandia sp. genus	6	Chromista : Foraminifera : Tubothalamea : Earlandiidae : *Earlandia*	318.1 - 314.6 Ma Carboniferous
Endothyra sp. genus	6	Chromista : Foraminifera : Tubothalamea : Endothyridae : *Endothyra*	318.1 - 314.6 Ma Carboniferous
Endothyranella sp. genus	6	Chromista : Foraminifera : Tubothalamea : Endothyridae : *Endothyranella*	318.1 - 314.6 Ma Carboniferous
Planoendothyra sp. genus	6	Chromista : Foraminifera : Tubothalamea : Endothyridae : *Planoendothyra*	318.1 - 314.6 Ma Carboniferous
Zellerina sp. genus	6	Foraminifera : Endothyridae : *Zellerina*	318.1 - 314.6 Ma Carboniferous
Eostaffella sp. genus	6	Chromista : Foraminifera : Tubothalamea : Eostaffellidae : *Eostaffella*	318.1 - 314.6 Ma Carboniferous
Millerella sp. genus	6	Chromista : Foraminifera : Tubothalamea : Ozawainellidae : *Millerella*	318.1 - 314.6 Ma Carboniferous
Palaeotextularia sp. genus	6	Chromista : Foraminifera : Globothalamea : Textulariida : Palaeotextulariidae : *Palaeotextularia*	339.4 - 314.6 Ma Carboniferous
Pseudoglomospira sp. genus	6	Chromista : Foraminifera : Tubothalamea : Pseudoammodiscidae : *Pseudoglomospira*	318.1 - 314.6 Ma Carboniferous
Pseudoendothyra sp. genus	6	Chromista : Foraminifera : Tubothalamea : Pseudoendothyridae : *Pseudoendothyra*	318.1 - 314.6 Ma Carboniferous
Eotuberitina sp. genus	6	Chromista : Foraminifera : Tubothalamea : Tuberitinidae : *Eotuberitina*	318.1 - 314.6 Ma Carboniferous

References

Gordon M., Yochelson E. L. (1975) Gastropoda, Cephalopoda, and Trilobita of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming, United States Geological Survey Professional Paper 848 F, 1-30

Sando W. J., Gordon, Jr. M., et al (1975) Stratigraphy and geologic history of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming, United States Geological Survey Professional Paper 848A, 1-83

Williams A., Carlson S. J., et al (2000) Part H Brachiopoda (revised): Volumes 2 & 3, Linguliformea, Craniiformea, Rhynchonelliformea (part)., Treatise on Invertebrate Paleontology, 1-919

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!

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