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

Mammalia
 Rodentia - Entoptychidae
Gregorymys riggsi Wood 1936 rodent
6 mi SW of Guernsey, Platte Co.; "Upper Harrison"
 Perissodactyla - Rhinocerotidae
Menoceras arikarense6 Barbour 1906 rhinoceros
Roll Quarry
 Perissodactyla - Equidae
Parahippus sp.3 Leidy 1858 anchitheriine horse
Roll Quarry
 Artiodactyla - Camelidae
Stenomylus gracilis1 Peterson 1907 camel
3 mi SE; 2 mi S ("low"); 4 mi SW ("high"); and 6 mi SW ("very high") of Guernsey
Tanymykter brachyodontus2 Peterson 1904 camel
3 mi SW of Guernsey, Upper Harrison equivalent
 Artiodactyla - Protoceratidae
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 - Merycoidodontidae
"Phenacocoelus stouti n. sp." = Merycoides stouti8, Merychyus minimus7, Merychyus arenarum7
"Phenacocoelus stouti n. sp." = Merycoides stouti8 Schultz and Falkenbach 1950 oreodont
"lower... Marsland" at Roll Quarry "2 mi. S. of Guernsey"
Merychyus minimus7 Peterson 1907 oreodont
"Guernsey area, Platte County"
Merychyus arenarum7 Cope 1884 oreodont
"Guernsey area, Platte County"
 Carnivora - Amphicyonidae
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 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"