Where: Goshen County, Wyoming (42.0° N, 104.2° W: paleocoordinates 42.9° N, 99.2° W)
• coordinate based on political unit
When: Marsland Formation (Hemingford Group), Harrisonian (24.8 - 18.5 Ma)
• = Upper Harrison beds
• bed-level stratigraphic resolution
Environment/lithology: terrestrial; lithology not reported
Size class: macrofossils
Primary reference: J. H. Wahlert and R. A. Souza. 1988. Skull morphology of Gregorymys and relationships of the Entoptychinae (Rodentia, Geomyidae). American Museum Novitates 2922:1-13 [J. Alroy/J. Alroy/J. Marcot]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 17793: authorized by John Alroy, entered by John Alroy on 07.06.1994, edited by Jonathan Marcot
Creative Commons license: CC BY (attribution)
Taxonomic list
possibly relevant: "Merychyus siouxensis" Schultz and Falkenbach 1947: 13 mi S of Jay Em
"Paraenhydrocyon brachypus" Wang 1994: 12 mi S of Jay Em, stratigraphic position uncertain
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Moropus hollandi1 Peterson 1913 chalicothere "chalicothere" of Skinner 1968, who gives the locality as "lower part of the exposures at a site that is 1 1/2 miles west of... Jay Em"
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Tanymykter brachyodontus3 Peterson 1904 camel "east side of road to Jay-Em Goshen County"; Upper Harrison equivalent
Stenomylus gracilis2 Peterson 1907 camel "Marsland"; E side of road to Jay-Em, 1.4 mi W of Jay-Em, and "Jay-Em very high"; see also Frick 1937
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Merycochoerus matthewi6, Merychyus arenarum7, Merychyus minimus7, "Phenacocoelus stouti" = Merycoides stouti8
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Desmocyon thomsoni10 Matthew 1907 bone-crushing dog "2 mi west of Jay-Em"; "Jay-Em, high in section"; "Jay-Em, high brown sand"; and "Jay-Em, below white layer"
Cynarctoides luskensis10 Wang et al. 1999 bone-crushing dog Jay Em area, "high brown sand" in Upper Harrison Beds
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Gregorymys riggsi Wood 1936 rodent | |