Hemicyon Quarry: Barstovian, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Proboscidea - Gomphotheriidae
Gomphotherium sp. Burmeister 1837
Kelly and Lander 1988
Mammalia - Carnivora - Amphicyonidae
Ischyrocyon sp. Matthew and Gidley 1904
Hunt 1998
Mammalia - Carnivora - Ursidae
Plithocyon barstowensis (Frick 1926)
Hunt 1998
Mammalia - Carnivora - Canidae
Leptocyon leidyi Tedford et al. 2009
Tedford et al. 2009
"Hemicyon stratum"
Microtomarctus conferta (Matthew 1918)
Wang et al. 1999
Hemicyon Stratum
Paratomarctus temerarius (Leidy 1858)
Wang et al. 1999
also Hemicyon Stratum
Aelurodon asthenostylus Wang et al. 1999
Wang et al. 1999
Hemicyon Stratum
Mammalia - Merycoidodontidae
Ustatochoerus medius (Leidy 1858)
Schultz and Falkenbach 1941
includes type of "Ustatochoerus medius mohavensis": Hemicyon Stratum
    = Mediochoerus mohavensis Schultz and Falkenbach 1941
Alroy 2002
original and current combination Ustatochoerus medius mohavensis
Mammalia - Tayassuidae
Dyseohyus fricki Stock 1937
Woodburne 1969
Mammalia - Antilocapridae
Meryceros joraki n. sp. Frick 1937
recombined as Merycodus joraki
Mammalia - Perissodactyla - Rhinocerotidae
Aphelops megalodus (Cope 1873)
Prothero 2005
Mammalia - Perissodactyla - Equidae
Megahippus mckennai Tedford and Alf 1962
Gonzalez and Lofgren 2013
FAM 21085
see common names

Geography
Country:United States State/province:California County:San Bernardino
Coordinates: 35.1° North, 117.1° West (view map)
Paleocoordinates:35.8° North, 114.1° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 5
*Period:Tertiary
Key time interval:Barstovian
Age range of interval:16.30000 - 12.50000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Barstow Member:Upper
Local section:Barst Local bed:6
Local order:bottom to top
Lithology and environment
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some genera
Reason for describing collection:taxonomic analysis
Museum repositories:AMNH
Collection method comments: AMNH collections only; see for L. A. Mus. no. V491 for later Tedford and Shultz collection
Taxonomic list comments:Hemicyon Stratum is about "3-30" m below the Hemicyon Tuff and main exposure is in Hemicyon Basin: Woodburne et al. 1990; although not discussed, it seems probable that Hemicyon Quarry is in the Hemicyon Stratum in Hemicyon Basin, and therefore just below the Hemicyon Tuff, which is dated at 14.0 +/- 0.1 Ma by MacFadden et al. 1990 (Ar-Ar)
generalized "Barstow Fauna" records of Woodburne et al. 1990, unless otherwise stated: Megahippus mckennai Merychippus sumani - type is from "Barstow": Merriam 1915d Pliosaccomys sp. "Miomastodon sp." Cynarctus galushai Wang et al. 1999: provenance of specimen unknown, but "preservation suggests Hemicyon Quarry" "Tomarctus" Jakway and Clement 1967: SW 1/4 sec 14 T11N R2W, San Bernardino County, upper Barstow Formation: this is in or near Hemicyon Basin "Tomarctus" Jakway and Clement 1967: UCR V-5201, "Barstow fossil beds" (no further data) Paratomarctus temerarius Wang et al. 1999: "First Division" Aelurodon asthenostylus Wang et al. 1999: "First Division"; "Prospect near Chert Ridge"; "Horizon below Split Ridge" Miolabis cf. fissidens Protolabis cf. barstowensis "Protolabis" cf. inaequidens Aepycamelus alexandrae - type, from "Fossiliferous Tuff member": see Davidson 1923
Metadata
Database number:19364
Authorizer:J. Alroy, J. Marcot Enterer:J. Alroy, J. Marcot
Modifier:J. Alroy Research group:vertebrate
Created:2000-05-19 00:00:00 Last modified:2007-08-30 20:31:04
Access level:the public Released:2000-05-19 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
6222. C. Frick. 1937. Horned ruminants of North America. Bulletin of the American Museum of Natural History 69:1-669 [J. Alroy/J. Alroy/M. Uhen]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
63541 B. Gonzalez and D. L. Lofgren. 2013. Review of Megahippus and Hypohippus from the Middle Miocene Barstow Formation of California. In R. E. Reynolds (ed.), Raising Questions in the Central Mojave Desert 78-89 [J. Marcot/J. Marcot]
1976 R. M. Hunt, Jr. 1998. Ursidae. In C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America 1:174-195 [J. Alroy/J. Alroy/M. Uhen]
1977 R. M. Hunt, Jr. 1998. Amphicyonidae. 196-227 [J. Alroy/J. Alroy/J. Alroy]
2070 T. S. Kelly and E. B. Lander. 1988. Biostratigraphy and Correlation of Hemingfordian and Barstovian Land Mammal Assemblages, Caliente Formation, Cuyama Valley Area, California. In W. J. M. Bazeley (ed.), Tertiary Tectonics and Sedimentation in the Cuyama Basin, San Luis Obispo, Santa Barbara, and Ventura Counties, California 1-19 [J. Alroy/J. Alroy/J. Marcot]
51726 D. R. Prothero. 2005. The Evolution of North American Rhinoceroses. 1-218 [J. Marcot/J. Marcot]
3063 C. B. Schultz and C. H. Falkenbach. 1941. Ticholeptinae, a new subfamily of oreodonts. Bulletin of the American Museum of Natural History 79(1):1-105 [J. Alroy/J. Alroy/J. Marcot]
52058 R. H. Tedford, X. Wang, and B. E. Taylor. 2009. Phylogenetic Systematics of the North American Fossil Caninae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 325:1-218 [J. Marcot/J. Marcot/G. Lloyd]
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]
3752ETE M. O. Woodburne. 1969. Systematics, biogeography, and evolution of Cynorca and Dyseohyus (Tayassuidae). Bulletin of the American Museum of Natural History 141(2):273-355 [J. Alroy/J. Alroy/M. Carrano]
3764 M. O. Woodburne, R. H. Tedford, and C. C. Swisher, III. 1990. Lithostratigraphy, biostratigraphy, and geochronology of the Barstow Formation, Mojave Desert, southern California. Geological Society America Bulletin 102(4):459-477 [J. Alroy/J. Alroy/J. Alroy]