Little Muddy Creek (Niobrara County): Arikareean, Wyoming

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Rodentia - Florentiamyidae
Florentiamys kennethi Wahlert 1983
Wahlert 1983
    = Sanctimus stuartae Macdonald 1970
Alroy 2002
Gering Fm.
Florentiamys kingi Wahlert 1983
Wahlert 1983
(3 measurements)
    = Florentiamys loomisi Wood 1936
Alroy 2002
Gering Fm.
Florentiamys kinseyi Wahlert 1983
Wahlert 1983
Gering Fm. (1 measurement)
Mammalia - Rodentia - Castoridae
Capacikala parvus n. sp. Xu 1996
"High level of middle brown sand, Little Muddy Creek" (i.e., upper level)
Capacikala gradatus (Cope 1878)
"Lower and middle Little Muddy Creek, Niobrara County"
Mammalia - Perissodactyla - Rhinocerotidae
Diceratherium armatum Marsh 1875
Prothero 2005
Diceratherium annectens (Marsh 1873)
Prothero 2005
"Middle Arikareean, Monroe Creek Formation, 3.5 miles west of Muddy Creek Bridge, Niobrara County, Wyoming"
Mammalia - Carnivora - Canidae
Ectopocynus antiquus n. sp. Wang 1994
Wang 1994
middle brown sand
Ectopocynus intermedius n. sp. Wang 1994
Wang 1994
10 ft below white layer in "low" horizon
Enhydrocyon pahinsintewakpa (Macdonald 1963)
Wang 1994
Philotrox condoni Merriam 1906
Wang 1994
level not indicated
Phlaocyon minor (Matthew 1907)
Wang et al. 1999
Archaeocyon leptodus (Schlaikjer 1935)
Wang et al. 1999
Otarocyon cooki (Macdonald 1963)
Wang et al. 1999
Mammalia - Ungulata - Merycoidodontidae
Desmatochoerus hatcheri (Douglass 1907)
Schultz and Falkenbach 1954
F:AM 33305 holotype of "Desmatochoerus hatcheri geringensis"
Mesoreodon megalodon Peterson 1907
Schultz and Falkenbach 1949
    = Desmatochoerus megalodon Peterson 1907
Alroy 2002
Megoreodon grandis (Douglass 1907)
Schultz and Falkenbach 1954
    = Merycochoerus superbus Leidy 1870
Alroy 2002
recombined as Promerycochoerus superbus
also their "Desmatochoerus hatcheri"; both from the Gering Fm.
Hadroleptauchenia densa (Loomis 1925)
Schultz and Falkenbach 1968
    = Leptauchenia major Leidy 1856
Alroy 2002
includes their "Pseudocyclopidius lullianus"; both from the "upper Gering"
Pithecistes altageringensis n. sp. Schultz and Falkenbach 1968
Schultz and Falkenbach 1968
    = Leptauchenia decora Leidy 1856
Alroy 2002
also their "L. parasimus" from "upper Gering"
Sespia nitida (Leidy 1869)
Schultz and Falkenbach 1968
Mesoreodon cheeki (Schlaikjer 1934)
Schultz and Falkenbach 1949
    = Mesoreodon minor Douglass 1903
Alroy 2002
includes "Desmatochoerus grangeri" and "D. wyomingensis" of Schultz and Falkenbach 1954
Desmatochoerus (Paradesmatochoerus) grangeri n. sp. Schultz and Falkenbach 1954
Schultz and Falkenbach 1954
synonym of Mesoreodon minor
F:AM 33303
Pseudodesmatochoerus milleri Schultz and Falkenbach 1954
Schultz and Falkenbach 1954
    = Merycoidodon major Leidy 1853
Alroy 2002
recombined as Merycoidodon (Otarohyus) major
Gering Fm.
Mammalia - Ungulata - Camelidae
Pseudolabis dakotensis Matthew 1904
Prothero 1996
"Little Muddy Creek area, Goshen Co."
Miotylopus leonardi (Loomis 1911)
Prothero 1996
"Little Muddy Creek area, Niobrara County"
Miotylopus gibbi (Loomis 1911)
Prothero 1996
"Little Muddy Creek, Niobrara County"
Mammalia - Ungulata - Moschidae
Parablastomeryx falkenbachi Frick 1937
Frick 1937
    = Pseudoblastomeryx falkenbachi Frick 1937
Alroy 2002
synonym of Pseudoblastomeryx advena
"Little Muddy Creek"
see common names

Geography
Country:United States State/province:Wyoming County:Niobrara
Coordinates: 43.0° North, 104.5° West (view map)
Paleocoordinates:43.9° North, 98.7° West
Basis of coordinate:based on political unit
Time
*Period:Tertiary *Epoch:Oligocene
Key time interval:Arikareean
Age range of interval:30.80000 - 20.43000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Lithology and environment
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Collection methods and comments
Collection excludes:some genera
Taxonomic list comments: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
Metadata
Database number:17532
Authorizer:J. Alroy, J. Marcot Enterer:J. Alroy, J. Marcot
Research group:vertebrate
Created:2000-05-19 00:00:00 Last modified:2002-06-03 03:27:42
Access level:the public Released:2000-05-19 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:

3779. 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]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Uhen]
6222 C. Frick. 1937. Horned ruminants of North America. Bulletin of the American Museum of Natural History 69:1-669 [J. Alroy/J. Alroy/J. Alroy]
28055% 6280D. R. Prothero. 1996. Camelidae. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 609-651 [J. Alroy/J. Alroy/J. Marcot]
51726 D. R. Prothero. 2005. The Evolution of North American Rhinoceroses. 1-218 [J. Marcot/J. Marcot]
3065 C. B. Schultz and C. H. Falkenbach. 1949. Promerycochoerinae, a new subfamily of oreodonts. Bulletin of the American Museum of Natural History 93(3):69-198 [J. Alroy/J. Alroy/J. Marcot]
3067 C. B. Schultz and C. H. Falkenbach. 1954. Desmatochoerinae, a new subfamily of oreodonts. Bulletin of the American Museum of Natural History 105(2) [J. Alroy/J. Alroy/J. Ju]
3069 C. B. Schultz and C. H. Falkenbach. 1968. The Phylogeny of the Oreodonts. Part 1: Merycoidodontinae, Eporeodontinae, and Leptaucheniinae, Three Subfamilies Of Oreodonts, With an Appendix to the Revision Of The Merycoidodontidae, and Part 2. Summary and Conclusions Concerning the Merycoidodontidae. Bulletin of the American Museum of Natural History 139:1-498 [J. Alroy/J. Alroy/J. Marcot]
3528 J. H. Wahlert. 1983. Relationships of the Florentiamyidae (Rodentia, Geomyoidea) based on cranial and dental morphology. American Museum Novitates 2769:1-23 [J. Alroy/J. Alroy/J. Marcot]
6226 X. Wang. 1994. Phylogenetic systematics of the Hesperocyoninae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 221:1-207 [J. Alroy/J. Alroy/J. Alroy]
3558 X. Wang, R. H. Tedford, and B. E. Taylor. 1999. Phylogenetic systematics of the Borophaginae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 243:1-392 [J. Alroy/J. Alroy/J. Alroy]