PBDB Collection

Fort Logan: Arikareean, Montana

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Mammalia - Lagomorpha - Leporidae

	Megalagus dawsoni n. sp. Black 1961	Black 1961
	sec 23 and sec 28 T11N R5E (3 measurements)

	Palaeolagus hypsodus Schlaikjer 1935	Black 1961
	sec 5 T10N R5E (3 measurements)
Mammalia - Rodentia - Castoridae

	Steneofiber montanus Scott 1893
	recombined as Agnotocastor montanus
Mammalia - Rodentia - Aplodontidae

	Niglarodon koerneri n. sp. Black 1961	Black 1961
	sec 4 T10N R5E
Mammalia - Rodentia - Cricetidae

	Eumys eliensis n. sp. Black 1961
	= Eumys brachyodus Wood 1937	Black 1961
	sec 28 T11N R5E
Mammalia - Carnivora - Canidae

	Cynodesmus thooides n. sp. Scott 1893
	from the Scott collection, see Wang 1994
Mammalia - Merycoidodontidae

	Cyclopidius loganensis n. sp. Koerner 1940
	synonym of Leptauchenia decora
	sec 5 T10N R5E; includes "Sespia heterodon" of Schultz and Falkenbach 1968 from "7 miles southeast of Fort Logan"

	Cyclopidius heterodon n. sp. Cope 1877	Colbert 1938
	recombined as Sespia heterodon

	Mesoreodon wheeleri n. sp. Koerner 1940	Stevens et al. 2023
	synonym of Desmatochoerus megalodon

	Promerycochoerus thorpei n. sp. Koerner 1940
	synonym of Desmatochoerus hatcheri

	Mesoreodon chelonyx Scott 1893
	includes "M. intermedius" and types of "M. danai," "M. wheeleri," and "Eporeodon meagherensis" of Koerner 1940, former two from sec 15 T10N R5E, latter from sec 17 T11N R5E

	Mesoreodon danai n. sp. Koerner 1940
	synonym of Mesoreodon chelonyx

	Eporeodon meagherensis n. sp. (Schultz and Falkenbach 1968)
	synonym of Mesoreodon chelonyx

	Mesoreodon intermedius Scott 1893
	synonym of Mesoreodon chelonyx
Mammalia - Camelidae

	Poebrotherium sp. Leidy 1847
	= Camelidae indet. Gray 1821	Alroy 2002
Mammalia - Hypertragulidae

	Hypertragulus calcaratus (Cope 1873)
Mammalia - Leptomerycidae

	Pronodens silberlingi n. gen., n. sp. Koerner 1940	Koerner 1940
	sec 4 T10N R5E (1 measurement)
Mammalia - Moschidae

	Blastomeryx gemmifer (Cope 1874)	Prothero 2008
	"AMNH 21306"
Mammalia - Perissodactyla - Rhinocerotidae

	Caenopus sp. Cope 1880
	= Rhinocerotidae indet. Gray 1821	Alroy 2002

	Diceratherium annectens (Marsh 1873)	Prothero 2005
	"Arikareean, Deep River beds, Fort Logan Formation, Meagher County, Montana"
Mammalia - Perissodactyla - Equidae

	Miohippus ? equiceps (Cope 1878)

	Miohippus ? annectens Marsh 1874
	present at Kew Quarry

	Miohippus ? anceps (Marsh 1874)
	not clear if this is valid
see common names

Geography

Country:	United States	State/province:	Montana	County:	Meagher
Coordinates:	46.5° North, 111.0° West (view map)
Paleocoordinates:	47.6° North, 105.1° West
Basis of coordinate:	based on political unit

Time


10 m.y. bin:	Cenozoic 4-5
*Period:	Tertiary	*Epoch:	Oligocene
Key time interval:	Arikareean
Age range of interval:	29.50000 - 18.50000 m.y. ago
* legacy (obsolete) database fields

Stratigraphy

Lithology and environment

Environment:

terrestrial indet.

Taphonomy

Modes of preservation:

body

Collection methods and comments

Taxonomic list comments:part of the "Deep River" fauna, restricted to the "older formation"; may still be stratigraphically mixed, but recognized by both Koerner 1940 and Tedford et al. 1987 and faunistically not at all unusual for a Gering equivalent
based on Wang 1994, collections of Scott 1895 include Crabtree Bluff, Thompson Gulch North, and Spring Creek and are therefore from the central part of T10N R5E

Metadata

Database number:	17509
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:

1382.

E. Douglass. 1903. New vertebrates from the Montana Tertiary. Annals of Carnegie Museum 2(5):145-199 [J. Alroy/J. Alroy/J. Alroy]

Secondary references:

6294		J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
1078		C. C. Black. 1961. Rodents and lagomorphs from the Miocene Fort Logan and Deep River Formation of Montana. Postilla 48:1-20 [J. Alroy/J. Alroy/J. Ju]
1252		E. H. Colbert. 1938. Pliocene peccaries from the Pacific Coast region of North America. Carnegie Institution of Washington Publication 487(6):241-269 [J. Alroy/J. Alroy/J. Marcot]
2094		H. E. Koerner. 1940. New vertebrates Part 1 of The geology and vertebrate paleontology of the Fort Logan and Deep River formations of Montana. American Journal of Science 238(12):837-862 [J. Alroy/J. Alroy/J. Ju]
51726		D. R. Prothero. 2005. The Evolution of North American Rhinoceroses. 1-218 [J. Marcot/J. Marcot]
51375		D. R. Prothero. 2008. Systematics of the musk deer (Artiodactyla: Moschidae: Blastomerycinae) from the Miocene of North America. In S. G. Lucas, G. S. Morgan, J. A. Spielmann, D. R. Prothero (eds.), Neogene Mammals 44:207-223 [J. Marcot/J. Marcot/J. Marcot]
86699		M. S. Stevens, D. R. Prothero, C. Cleaveland, E. Welsh, K. Marriott, T. Htun, D. Balassa, S. M. Olson, K. I. Watmore and D. Wheeler. 2023. Systematics of the Late Oligocene and Miocene Oreodonts (Merycoidodontidae: Artiodactyla). New Mexico Museum of Natural History and Science Bulletin 93:1-226 [J. Marcot/J. Marcot]