PBDB Collection

Guernsey ( of the United States)

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 - 18.5 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

Show authors, comments, and common names

Mammalia
Perissodactyla - Equidae	Parahippus sp.³ Parahippus sp.³ Leidy 1858 anchitheriine horse Roll Quarry
Perissodactyla - Rhinocerotidae	Menoceras arikarense⁶ Menoceras arikarense⁶ Barbour 1906 rhinoceros Roll Quarry
Artiodactyla - Protoceratidae	Syndyoceras cooki⁵ 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"
Artiodactyla - Camelidae	Tanymykter brachyodontus², Stenomylus gracilis¹ Tanymykter brachyodontus² Peterson 1904 camel 3 mi SW of Guernsey, Upper Harrison equivalent Stenomylus gracilis¹ Peterson 1907 camel 3 mi SE; 2 mi S ("low"); 4 mi SW ("high"); and 6 mi SW ("very high") of Guernsey
Artiodactyla - Merycoidodontidae	Merychyus arenarum⁷, Merychyus minimus⁷, "Phenacocoelus stouti n. sp." = Merycoides stouti⁸ Merychyus arenarum⁷ Cope 1884 oreodont "Guernsey area, Platte County" Merychyus minimus⁷ Peterson 1907 oreodont "Guernsey area, Platte County" "Phenacocoelus stouti n. sp." = Merycoides stouti⁸ Schultz and Falkenbach 1950 oreodont "lower... Marsland" at Roll Quarry "2 mi. S. of Guernsey"
Carnivora - Amphicyonidae	Adilophontes brachykolos³, Temnocyon macrogenys n. sp.⁴ Adilophontes brachykolos³ Hunt 2002 bear-dog Roll Quarry 3 mi S of Guernsey Temnocyon macrogenys n. sp.⁴ Hunt 2011 bear-dog "Upper Harrison beds, near Guernsey"
Carnivora - Canidae	Paraenhydrocyon wallovianus⁹, Desmocyon thomsoni¹⁰, Phlaocyon minor¹⁰ Paraenhydrocyon wallovianus⁹ Cope 1881 canid 5 mi SE of Guernsey, Platte Co., "possibly Upper Arikaree Group" 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" Phlaocyon minor¹⁰ Matthew 1907 bone-crushing dog "Upper Harrison beds... 3 mi southeast of Guernsey, 7 ft below the green-white layer"
Rodentia - Entoptychidae	Gregorymys riggsi Gregorymys riggsi Wood 1936 rodent 6 mi SW of Guernsey, Platte Co.; "Upper Harrison"

¹Frick and Taylor 1968; ²Honey and Taylor 1978; ³Hunt 2002; ⁴Hunt 2011; ⁵Patton and Taylor 1971; ⁶Prothero 2005; ⁷Schultz and Falkenbach 1947; ⁸Schultz and Falkenbach 1950; ⁹Wang 1994; ¹⁰Wang et al. 1999