PBDB Collection

Horse and Mastodon Quarry: Barstovian, Colorado

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Mammalia - Carnivora - Canidae

	Microtomarctus conferta (Matthew 1918)	Wang et al. 1999
	Horse Quarry; also at "Martin Canyon... Cedar Creek, horizon E" (said to be the same age and in the same county)

	Carpocyon compressus (Cope 1890)	Wang et al. 1999
	Horse Quarry

	Aelurodon asthenostylus Wang et al. 1999	Wang et al. 1999
	Horse Quarry

	Tomarctus brevirostris Cope 1873	Wang et al. 1999
	Cedar Creek; Horse Quarry; probably includes "Aelurodon sp."
Mammalia - Carnivora - Amphicyonidae

	Amphicyon ingens Matthew 1924	Hunt 1998
	also at West Quarry
Mammalia - Perissodactyla - Equidae

	Merychippus sejunctus (Cope 1874)
	= Protohippus sejunctus Cope 1874	Hulbert 1989
	recombined as Merychippus sejunctus
	pers. commun. 1989

	Merychippus sphenodus (Cope 1889)	Woodburne 1996
	recombined as Cormohipparion sphenodus
	sensu stricto; additional material is from Dark Cap Quarry = West Quarry, in unit just below H & M Quarry

	Pliohippus mirabilis (Leidy 1858)	Hulbert 1989
	pers. commun. 1989

	Megahippus sp. McGrew 1938	Skinner and Johnson 1984
Mammalia - Perissodactyla - Rhinocerotidae

	Aphelops megalodus (Cope 1873)	Prothero 2005

	Teleoceras medicornutum Osborn 1904	Prothero and Manning 1987
	confirmed by Mead 1999b; "T. sp."
Mammalia - Merycoidodontidae

	Ustatochoerus medius (Leidy 1858)
	= Merychyus cf. medius Leidy 1858	Alroy 2002
	recombined as Ustatochoerus medius
	from Horse Quarry, Mastodont Quarry: Schultz and Falkenbach 1941
Mammalia - Palaeomerycidae

	Dromomeryx pawniensis n. sp. Frick 1937	Frick 1937
	synonym of Dromomeryx borealis
	Horse Quarry; Mastodon Quarry; "east of camp"; "Section 8"; "Lower Mastodon Quarry"; also postcrania from "6 miles N.E. of Pawnee Buttes"
Mammalia - Antilocapridae

	Meryceros minor n. sp. Frick 1937
	= Submeryceros minor Frick 1937	Frick 1937
	recombined as Merycodus minor
	of "S. minor pawniensis" from Lower Mastodon Quarry may include "Merycodus sp."

	Meryceros warreni (Leidy 1858)
	= Merycodus warreni Leidy 1858	Frick 1937
	"east of camp"; Horse Quarry; Mastodon Quarry

	Paracosoryx sp. (Frick 1937)
	original and current combination Cosoryx (Paracosoryx)
Mammalia - Proboscidea - Gomphotheriidae

	Gomphotheriidae indet. Hay 1922
	may include type of "Rhynchotherium rectidens" of Osborn 1923 from "near Pawnee Buttes, Middle Miocene of Colorado"
Mammalia - Proboscidea - Mammutidae

	Miomastodon sp. Osborn 1922
	= Zygolophodon sp. Vacek 1877	Alroy 2002
see common names

Geography

Country:	United States	State/province:	Colorado	County:	Weld
Coordinates:	40.8° North, 104.2° West (view map)
Paleocoordinates:	41.4° North, 101.0° West
Basis of coordinate:	based on political unit
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:	Pawnee Creek
Local section:	PwnCr	Local bed:	4
Local order:	bottom to top
Stratigraphy comments: upper part of formation sensu stricto, and there is a "radioisotopic" (Ar-Ar?) date of 14.4 Ma for an ash in the middle level of the formation: Woodburne 1996a this date apparently is an average of the dates of 14.5 +/- 0.09 and 14.3 +/- 0.02 Ma (Ar/Ar) given by Dold and Prothero 2003 for the "middle part of the section"

Lithology and environment

Environment:

terrestrial indet.

Taphonomy

Modes of preservation:

body

Collection methods and comments

Reason for describing collection:	biostratigraphic analysis
Taxonomic list comments:possibly relevant: "Dyseohyus stirtoni" Woodburne 1969: type, "2 miles northwest of Mastodon Quarry... 8 miles east and 4 miles south of Grover, Weld County" "Barbouromeryx (Bouromeryx) pawniensis" Frick 1937: type, "two miles W. of Mastodon Quarry"; also from "Section 8"

Metadata

Database number:	18203
Authorizer:	J. Alroy, J. Marcot	Enterer:	J. Alroy, J. Marcot
Modifier:	J. Alroy	Research group:	vertebrate
Created:	1992-08-05 00:00:00	Last modified:	2007-01-13 16:38:27
Access level:	the public	Released:	1992-08-05 00:00:00
Creative Commons license:	CC BY

Reference information

Primary reference:

6198.

R. H. Tedford, T. Galusha, M. F. Skinner, B. E. Taylor, R. W. Fields, J. R. Macdonald, J. M. Rensberger, S. D. Webb, and D. P. Whistler. 1987. Faunal succession and biochronology of the Arikareean through Hemphillian interval (late Oligocene through earliest Pliocene epochs) in North America. In M. O. Woodburne (ed.), Cenozoic Mammals of North America: Geochronology and Biostratigraphy 153-210 [J. Alroy/J. Alroy/P. Wagner]

Secondary references:

6294		J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
9544		P. E. Dold and D. R. Prothero. 2003. Magnetic stratigraphy of the lower-middle Miocene Pawnee Creek and Martin Canyon formations, northeastern Colorado. Journal of Vertebrate Paleontology 23(3):46A [J. Alroy/J. Alroy/J. Alroy]
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]
1952		R. C. Hulbert, Jr. 1989. Phylogenetic Interrelationships and Evolution of North American Late Equidae. In D. R. Prothero and R. M. Schoch (eds.), The Evolution of Perissodactyls [J. Alroy/J. Alroy/M. Uhen]
1977		R. M. Hunt, Jr. 1998. Amphicyonidae. 196-227 [J. Alroy/J. Alroy/J. Alroy]
51726		D. R. Prothero. 2005. The Evolution of North American Rhinoceroses. 1-218 [J. Marcot/J. Marcot]
2807		D. R. Prothero and E. M. Manning. 1987. Miocene rhinoceroses from the Texas Gulf Coastal Plain. Journal of Paleontology 61(2):388-423 [J. Alroy/J. Alroy/M. Carrano]
6193		M. F. Skinner and F. W. Johnson. 1984. Tertiary stratigraphy and the Frick Collection of fossil vertebrates from north-central Nebraska. Bulletin of the American Museum of Natural History 178(3):1-368 [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]
3755		M. O. Woodburne. 1996. Reappraisal of the Cormohipparion from the Valentine Formation, Nebraska. American Museum Novitates 3163:1-56 [J. Alroy/J. Alroy/J. Marcot]