Fort Logan ( of the United States)

Where: Meagher County, Montana (46.5° N, 111.0° W: paleocoordinates 47.6° N, 105.1° W)

• coordinate based on political unit

When: Arikareean (30.8 - 20.4 Ma)

Environment/lithology: terrestrial

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

PaleoDB collection 17509: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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
 Rodentia - Cricetidae
Eumys brachyodus2 Wood 1937 mouse
 Rodentia - Aplodontidae
Niglarodon koerneri n. sp.2 Black 1961 mountain beaver
sec 4 T10N R5E
 Rodentia - Castoridae
Agnotocastor montanus1 Scott 1893 beaver
 Lagomorpha - Leporidae
Palaeolagus hypsodus2 Schlaikjer 1935 rabbit
sec 5 T10N R5E
Megalagus dawsoni n. sp.2 Black 1961 rabbit
sec 23 and sec 28 T11N R5E
 Perissodactyla - Rhinocerotidae
Rhinocerotidae indet.1 Gray 1821 rhinoceros
Diceratherium annectens4 Marsh 1873 rhinoceros
"Arikareean, Deep River beds, Fort Logan Formation, Meagher County, Montana"
 Perissodactyla - Equidae
Miohippus ? anceps Marsh 1874 anchitheriine horse
not clear if this is valid
Miohippus ? annectens Marsh 1874 anchitheriine horse
present at Kew Quarry
Miohippus ? equiceps Cope 1878 anchitheriine horse
 Carnivora - Canidae
Cynodesmus thooides n. sp. Scott 1893 canid
from the Scott collection, see Wang 1994
 Ungulata - Merycoidodontidae
Leptauchenia decora3 Leidy 1856 oreodont
Mesoreodon chelonyx Scott 1893 oreodont
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
 Ungulata - Camelidae
Camelidae indet.1 Gray 1821 camel
 Ungulata - Hypertragulidae
Hypertragulus calcaratus Cope 1873 ruminant
 Ungulata - Leptomerycidae
Pronodens silberlingi n. sp.3 Koerner 1940 ruminant
sec 4 T10N R5E
 Ungulata - Moschidae
Blastomeryx gemmifer5 Cope 1874 musk deer
"AMNH 21306"