Also known as Roll Quarry
Where: Platte County, Wyoming (42.1° N, 105.0° W: paleocoordinates 43.0° N, 100.0° W)
• coordinate based on political unit
When: Marsland Formation (Hemingford Group), Harrisonian (24.8 - 20.4 Ma)
• = Upper Harrison beds
• group of beds-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: taxonomic analysis
PaleoDB collection 17788: authorized by John Alroy, entered by John Alroy on 26.03.1995, edited by Jonathan Marcot
Creative Commons license: CC BY (attribution)
Taxonomic list
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Stenomylus gracilis1 Peterson 1907 camel 3 mi SE; 2 mi S ("low"); 4 mi SW ("high"); and 6 mi SW ("very high") of Guernsey
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Syndyoceras cooki5 Barbour 1905 protoceratid Roll Quarry (3 mi S of Guernsey) and prospects 3 mi SE of Guernsey, Platte Co., in the "lower... Marsland"
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"Phenacocoelus stouti n. sp." = Merycoides stouti8 Schultz and Falkenbach 1950 oreodont "lower... Marsland" at Roll Quarry "2 mi. S. of Guernsey"
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Paraenhydrocyon wallovianus9 Cope 1881 canid 5 mi SE of Guernsey, Platte Co., "possibly Upper Arikaree Group"
Phlaocyon minor10 Matthew 1907 bone-crushing dog "Upper Harrison beds... 3 mi southeast of Guernsey, 7 ft below the green-white layer"
Desmocyon thomsoni10 Matthew 1907 bone-crushing dog "Upper Harrison beds... 6 mi west of Guernsey, high brown sand" and "2 mi southwest of Guernsey, 20 ft above white layer"
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