PBDB Collection

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 - 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 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"

Show authors, comments, and common names

Mammalia
Rodentia - Entoptychidae	Gregorymys riggsi Gregorymys riggsi Wood 1936 rodent
Carnivora - Amphicyonidae	Daphoenodon skinneri n. sp.¹ Daphoenodon skinneri n. sp.¹ Hunt 2002 bear-dog "Upper Harrison beds, Royal Valley District"
Carnivora - Canidae	Paraenhydrocyon wallovianus⁶, Desmocyon thomsoni⁷, Phlaocyon minor⁷ 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
Artiodactyla - Merycoidodontidae	Merycochoerus matthewi³, "Phenacocoelus stouti" = Merycoides stouti⁵, Merychyus minimus⁴ Merycochoerus matthewi³ Loomis 1924 oreodont "Phenacocoelus stouti" = Merycoides stouti⁵ Schultz and Falkenbach 1950 oreodont "Royal Valley, 9 mi. S. of Lusk" Merychyus minimus⁴ Peterson 1907 oreodont Royal Valley 9 mi S of Lusk
Perissodactyla - Rhinocerotidae	Menoceras arikarense² Menoceras arikarense² Barbour 1906 rhinoceros

¹Hunt 2002; ²Prothero 2005; ³Schultz and Falkenbach 1940; ⁴Schultz and Falkenbach 1947; ⁵Schultz and Falkenbach 1950; ⁶Wang 1994; ⁷Wang et al. 1999