Roundhouse Rock Gap: Arikareean, Nebraska

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Camelidae
Miotylopus brachygnathus
    = Miotylopus gibbi Loomis 1911
Alroy 2002
repeats misspelling of McKenna and Love 1972
Mammalia - Merycoidodontidae
Desmatochoerus (Paradesmatochoerus) wyomingensis Schultz and Falkenbach 1954
Schultz and Falkenbach 1954
synonym of Mesoreodon minor
Mo-107 and -108
Sespia marianae Schultz and Falkenbach 1968
    = Sespia nitida Leidy 1869
Schultz and Falkenbach 1968
also their "Megasespia middleswarti"; both from UNSM Mo-104, lower Gering; some small chance these are from Nipple Butte Quarry, a small mammal quarry within UNSM Mo-104
Pseudocyclopidius major (Leidy 1856)
    = Leptauchenia major Leidy 1856
Schultz and Falkenbach 1968
"east side of Roundhouse Rock... 15' above base of Gering"; includes their "Hadroleptauchenia shanafeltae" type "lower" Gering at UNSM Mo-104, Roundhouse Rock; also their "H. densa" from "upper" Gering at UNSM Mo-104
Mammalia - Carnivora - Palaeogalidae
Palaeogale dorothiae Macdonald 1963
Mammalia - Carnivora - Canidae
Archaeocyon leptodus (Schlaikjer 1935)
Wang et al. 1999
"15 ft above marl, upper part" of member
see common names

Geography
Country:United States State/province:Nebraska County:Morrill
Coordinates: 41.7° North, 103.1° West (view map)
Paleocoordinates:42.6° North, 97.3° 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
Formation:Brule Member:Brown Siltstone
Local section:NPlat Local bed:5
Local order:bottom to top
Stratigraphy comments: Unit A
Lithology and environment
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Collection methods and comments
Taxonomic list comments:a.k.a. Horn Member of Brule Formation
said to include both the E of and 1/4 mi NW of Roundhouse Rock localities by Schultz and Falkenbach 1968
Roundhouse Rock Ash dated at 28.59 +/- 0.32 Ma by Prothero and Swisher 1992; this is within Unit A based on Tedford et al. 1996
status unclear: Mesoreodon "cheeki" Schultz and Falkenbach 1949: Gering Fm. at "Round House Rock, Pumpkin Creek, Morrill County" "Mesoreodon" megalodon Schultz and Falkenbach 1949: Gering Fm. at "Round House Rock" "Desmatochoerus wyomingensis" Schultz and Falkenbach 1954: "Roundhouse Rock"
Mesoreodon does not range above Gering B, which is not exposed at Roundhouse Rock
Metadata
Also known as:Mo-104, in part
Database number:17602
Authorizer:J. Alroy, J. Marcot Enterer:J. Alroy, J. Marcot
Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2002-06-03 03:27:42
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:

3345. C. C. Swisher. 1982. Stratigraphy and biostratigraphy of the eastern portion of the Wildcat Ridge, western Nebraska. 1-172 [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. Kouvari]
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]
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]