Royal Valley ( of the United States)

Where: Niobrara County, Wyoming (42.6° N, 104.4° W: paleocoordinates 43.5° N, 99.3° W)

• coordinate based on political unit

• local area-level geographic resolution

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 17833: authorized by John Alroy, entered by John Alroy on 26.03.1995, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• possibly relevant: Stenomylus gracilis Frick and Taylor 1968: 7 mi SE of Lusk, Niobrara Co. Problastomeryx olcotti Frick 1937: "Harrison... 9 miles S.E. of Lusk" Pseudoblastomeryx ("Parablastomeryx") falkenbachi Frick 1937: "10 miles S.E. of Lusk"
Mammalia
 Rodentia - Geomyidae
Gregorymys riggsi Wood 1936 pocket gopher
 Perissodactyla - Rhinocerotidae
Menoceras arikarense3 Barbour 1906 rhinoceros
 Carnivora - Amphicyonidae
Daphoenodon skinneri n. sp.2 Hunt 2002 bear-dog
"Upper Harrison beds, Royal Valley District"
 Carnivora - Canidae
Paraenhydrocyon wallovianus6 Cope 1881 canid
9 mi S of Lusk, "Marsland" Fm.
Desmocyon thomsoni7 Matthew 1907 bone-crushing dog
"Upper Harrison beds... 9 mi south of Lusk" and "Royal Valley"
Phlaocyon minor7 Matthew 1907 bone-crushing dog
 Ungulata - Merycoidodontidae
Merychyus minimus5 Peterson 1907 oreodont
Royal Valley 9 mi S of Lusk
Merycoides longiceps1 Douglass 1907 oreodont
Merycochoerus matthewi4 Loomis 1924 oreodont