PBDB Collection

Hemicyon Quarry (Miocene of the United States)

Where: San Bernardino County, California (35.1° N, 117.1° W: paleocoordinates 35.8° N, 114.1° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Upper Member (Barstow Formation), Barstovian (16.3 - 12.5 Ma)

Environment/lithology: terrestrial

Size class: macrofossils

Reposited in the AMNH

• AMNH collections only; see for L. A. Mus. no. V491 for later Tedford and Shultz collection

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 19364: authorized by John Alroy, entered by John Alroy on 19.05.2000, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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

Show authors, comments, and common names

Mammalia
Proboscidea - Gomphotheriidae	Gomphotherium sp.⁵ Gomphotherium sp.⁵ Burmeister 1837 gomphothere
Carnivora - Ursidae	Plithocyon barstowensis³ Plithocyon barstowensis³ Frick 1926 bear
Carnivora - Amphicyonidae	Ischyrocyon sp.⁴ Ischyrocyon sp.⁴ Matthew and Gidley 1904 bear-dog
Carnivora - Canidae	Aelurodon asthenostylus⁸, Paratomarctus temerarius⁸, Microtomarctus conferta⁸, Leptocyon leidyi⁷ Aelurodon asthenostylus⁸ Wang et al. 1999 bone-crushing dog Hemicyon Stratum Paratomarctus temerarius⁸ Leidy 1858 bone-crushing dog also Hemicyon Stratum Microtomarctus conferta⁸ Matthew 1918 bone-crushing dog Hemicyon Stratum Leptocyon leidyi⁷ Tedford et al. 2009 canine "Hemicyon stratum"
Perissodactyla - Equidae	Megahippus mckennai² Megahippus mckennai² Tedford and Alf 1962 anchitheriine horse FAM 21085
Perissodactyla - Rhinocerotidae	Aphelops megalodus⁶ Aphelops megalodus⁶ Cope 1873 rhinoceros
Artiodactyla - Merycoidodontidae	Mediochoerus mohavensis¹ Mediochoerus mohavensis¹ Schultz and Falkenbach 1941 oreodont includes type of "Ustatochoerus medius mohavensis": Hemicyon Stratum
Artiodactyla - Tayassuidae	Dyseohyus fricki⁹ Dyseohyus fricki⁹ Stock 1937 peccary
Artiodactyla - Antilocapridae	"Meryceros joraki n. sp." = Merycodus joraki "Meryceros joraki n. sp." = Merycodus joraki Frick 1937 pronghorn

¹Alroy 2002; ²Gonzalez and Lofgren 2013; ³Hunt 1998; ⁴Hunt 1998; ⁵Kelly and Lander 1988; ⁶Prothero 2005; ⁷Tedford et al. 2009; ⁸Wang et al. 1999; ⁹Woodburne 1969