PBDB Collection

Little Muddy Creek (Niobrara County) ( of the United States)

Where: Niobrara County, Wyoming (43.0° N, 104.5° W: paleocoordinates 43.9° N, 98.7° W)

• coordinate based on political unit

When: Arikareean (29.5 - 18.5 Ma)

Environment/lithology: terrestrial

Primary reference: X. Xu. 1996. Castoridae. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 412-432 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 17532: authorized by John Alroy, entered by John Alroy on 19.05.2000, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• Xu 1996 implies that the lower/middle levels are significantly older than the upper level, but separating out the records is impossible given the available literature

Show authors, comments, and common names

Mammalia
Rodentia - Castoridae	Capacikala gradatus, Capacikala parvus n. sp. Capacikala gradatus Cope 1878 beaver "Lower and middle Little Muddy Creek, Niobrara County" Capacikala parvus n. sp. Xu 1996 beaver "High level of middle brown sand, Little Muddy Creek" (i.e., upper level)
Rodentia - Florentiamyidae	Florentiamys kinseyi⁸, Florentiamys kingi⁸, "Florentiamys kennethi" = Florentiamys tiptoni⁸ Florentiamys kinseyi⁸ Wahlert 1983 rodent Gering Fm. Florentiamys kingi⁸ Wahlert 1983 rodent Gering Fm. "Florentiamys kennethi" = Florentiamys tiptoni⁸ Macdonald 1970 rodent
Artiodactyla - Merycoidodontidae	"Mesoreodon megalodon" = Desmatochoerus megalodon⁵, Desmatochoerus hatcheri⁶, Pseudodesmatochoerus milleri⁶, Megoreodon grandis⁶, "Desmatochoerus wyomingensis" = Mesoreodon minor², "Desmatochoerus (Paradesmatochoerus) grangeri n. sp." = Mesoreodon minor⁶, "Mesoreodon cheeki" = Mesoreodon minor⁵, Sespia nitida⁷, "Hadroleptauchenia densa" = Leptauchenia major⁷, "Pithecistes altageringensis n. sp." = Leptauchenia decora⁷ "Mesoreodon megalodon" = Desmatochoerus megalodon⁵ Peterson 1907 oreodont Desmatochoerus hatcheri⁶ Douglass 1907 oreodont F:AM 33305 holotype of "Desmatochoerus hatcheri geringensis" Pseudodesmatochoerus milleri⁶ Schultz and Falkenbach 1954 oreodont Gering Fm. Megoreodon grandis⁶ Douglass 1907 oreodont "Desmatochoerus wyomingensis" = Mesoreodon minor² Douglass 1903 oreodont "Desmatochoerus (Paradesmatochoerus) grangeri n. sp." = Mesoreodon minor⁶ Douglass 1903 oreodont F:AM 33303 "Mesoreodon cheeki" = Mesoreodon minor⁵ Douglass 1903 oreodont Sespia nitida⁷ Leidy 1869 oreodont "Hadroleptauchenia densa" = Leptauchenia major⁷ Leidy 1856 oreodont includes their "Pseudocyclopidius lullianus"; both from the "upper Gering" "Pithecistes altageringensis n. sp." = Leptauchenia decora⁷ Leidy 1856 oreodont also their "L. parasimus" from "upper Gering"
Artiodactyla - Moschidae	"Parablastomeryx falkenbachi" = Pseudoblastomeryx advena¹ "Parablastomeryx falkenbachi" = Pseudoblastomeryx advena¹ Matthew 1907 musk deer "Little Muddy Creek"
Artiodactyla - Camelidae	Miotylopus gibbi³, Miotylopus leonardi³, Pseudolabis dakotensis³ Miotylopus gibbi³ Loomis 1911 camel "Little Muddy Creek, Niobrara County" Miotylopus leonardi³ Loomis 1911 camel "Little Muddy Creek area, Niobrara County" Pseudolabis dakotensis³ Matthew 1904 camel "Little Muddy Creek area, Goshen Co."
Perissodactyla - Rhinocerotidae	Diceratherium armatum⁴, Diceratherium annectens⁴ Diceratherium armatum⁴ Marsh 1875 rhinoceros Diceratherium annectens⁴ Marsh 1873 rhinoceros "Middle Arikareean, Monroe Creek Formation, 3.5 miles west of Muddy Creek Bridge, Niobrara County, Wyoming"
Carnivora - Canidae	Philotrox condoni⁹, Enhydrocyon pahinsintewakpa⁹, Ectopocynus intermedius n. sp.⁹, Ectopocynus antiquus n. sp.⁹, Archaeocyon leptodus¹⁰, Phlaocyon minor¹⁰, Otarocyon cooki¹⁰ Philotrox condoni⁹ Merriam 1906 canid level not indicated Enhydrocyon pahinsintewakpa⁹ Macdonald 1963 canid Ectopocynus intermedius n. sp.⁹ Wang 1994 canid 10 ft below white layer in "low" horizon Ectopocynus antiquus n. sp.⁹ Wang 1994 canid middle brown sand Archaeocyon leptodus¹⁰ Schlaikjer 1935 bone-crushing dog Phlaocyon minor¹⁰ Matthew 1907 bone-crushing dog Otarocyon cooki¹⁰ Macdonald 1963 bone-crushing dog

¹Frick 1937; ²Korth and Evander 2016; ³Prothero 1996; ⁴Prothero 2005; ⁵Schultz and Falkenbach 1949; ⁶Schultz and Falkenbach 1954; ⁷Schultz and Falkenbach 1968; ⁸Wahlert 1983; ⁹Wang 1994; ¹⁰Wang et al. 1999