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 - 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

 Rodentia - Geomyidae
Gregorymys riggsi Wood 1936 pocket gopher
6 mi SW of Guernsey, Platte Co.; "Upper Harrison"
 Perissodactyla - Rhinocerotidae
Menoceras arikarense7 Barbour 1906 rhinoceros
Roll Quarry
 Perissodactyla - Equidae
Parahippus sp.4 Leidy 1858 anchitheriine horse
Roll Quarry
 Carnivora - Amphicyonidae
Temnocyon macrogenys n. sp.5 Hunt 2011 bear-dog
"Upper Harrison beds, near Guernsey"
Adilophontes brachykolos4 Hunt 2002 bear-dog
Roll Quarry 3 mi S of Guernsey
 Carnivora - Canidae
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"
 Ungulata - Merycoidodontidae
Merychyus arenarum8 Cope 1884 oreodont
"Guernsey area, Platte County"
Merychyus minimus8 Peterson 1907 oreodont
"Guernsey area, Platte County"
Merycoides longiceps1 Douglass 1907 oreodont
 Ungulata - Camelidae
Stenomylus gracilis2 Peterson 1907 camel
3 mi SE; 2 mi S ("low"); 4 mi SW ("high"); and 6 mi SW ("very high") of Guernsey
Tanymykter brachyodontus3 Peterson 1904 camel
3 mi SW of Guernsey, Upper Harrison equivalent
 Ungulata - Protoceratidae
Syndyoceras cooki6 Barbour 1905 protoceratid
Roll Quarry (3 mi S of Guernsey) and prospects 3 mi SE of Guernsey, Platte Co., in the "lower... Marsland"