Sixty Six Mountain (Upper) ( of the United States)
Also known as 66 Mountain
Where: Goshen County, Wyoming (42.0° N, 104.2° W: paleocoordinates 42.9° N, 98.4° W)
• coordinate based on political unit
When: Lower Member (Harrison Formation), Arikareean (29.5 - 18.5 Ma)
• group of beds-level stratigraphic resolution
Environment/lithology: terrestrial; lithology not reported
Size class: macrofossils
Primary reference: E. M. Schlaikjer. 1935. Contributions to the Stratigraphy and Palaeontology of the Goshen Hole Area, Wyoming. III. A New Basal Oligocene Formation. Bulletin of the Museum of Comparative Zoology 76(3):71-93 [J. Alroy/J. Alroy/J. Marcot]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 17667: authorized by John Alroy, entered by John Alroy on 26.07.1994, edited by Jonathan Marcot
Creative Commons license: CC BY (attribution)
Taxonomic list
• said to be "at least as old as the Monroe Creek Formation" by McKenna and Love 1972 and "Gering" by Schultz and Falkenbach 1949
at least five localities within a 3 by 3 mile block spanning 120 to 200 feet "above the Brule-lower Harrison contact"; Black 1961b indicates that the contact is lower in this area than Schlaikjer believed, but this fauna still should pertain to the upper "Lower Harrison"
"Desmatochoerus anthonyi" specimen of Schultz and Falkenbach 1968 from N side of 66 Mountain is actually Merycoidodon major from 60' below Upper Whitney Ash in Whitney Mbr.: Stevens and Stevens 1996; not clear if this level includes other specimens of Schlaikjer
at least five localities within a 3 by 3 mile block spanning 120 to 200 feet "above the Brule-lower Harrison contact"; Black 1961b indicates that the contact is lower in this area than Schlaikjer believed, but this fauna still should pertain to the upper "Lower Harrison"
"Desmatochoerus anthonyi" specimen of Schultz and Falkenbach 1968 from N side of 66 Mountain is actually Merycoidodon major from 60' below Upper Whitney Ash in Whitney Mbr.: Stevens and Stevens 1996; not clear if this level includes other specimens of Schlaikjer
Show authors, comments, and common names
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"Menoceras cooki" = Menoceras arikarense
"Menoceras cooki" = Menoceras arikarense Barbour 1906 rhinoceros 120 feet; specimen appears to be indeterminate based on description and could be Diceratherium
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Dinohyus minimus n. sp.
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"Nanotragulus intermedius" = Nanotragulus loomisi
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Pseudolabis dakotensis1 Matthew 1904 camel "south side of 66 Mountain, 15 feet below white layer"; presumably includes "Protomeryx sp.," which was compared to Pseudolabis and Dyseotylopus by McKenna 1966
"Miotylopus bathygnathus n. sp." = Miotylopus gibbi Loomis 1911 camel 150 feet referred to as "Goshen Hole" by Prothero 1996d
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Sespia nitida5, "Cyclopidius lullianus" = Leptauchenia lullianus, "Leptauchenia decora" = Leptauchenia decora5, "Leptauchenia parasimus" = Leptauchenia decora5, "Pithecistes altageringensis" = Leptauchenia decora5, "Promerycochoerus hatcheri" = Desmatochoerus hatcheri3, "Mesoreodon megalodon" = Desmatochoerus megalodon, "Mesoreodon minor" = Mesoreodon minor2, "Desmatochoerus (Paradesmatochoerus) wyomingensis" = Mesoreodon minor4, Mesoreodon chelonyx3, "Desmatochoerus (Paradesmatochoerus) anthonyi" = Merycoidodon major5
"Cyclopidius lullianus" = Leptauchenia lullianus Thorpe 1921 oreodont "lowermost Miocene"; skeleton illustrated by Loomis 1925; also "Hadroleptauchenia densa" Schultz and Falkenbach 1968 from "W. end of south side of 66 Mt." and "S. side of 66 Mt." and "Pseudocyclopidius lullianus" from "S. side of 66 Mt." all in "Gering"
"Leptauchenia parasimus" = Leptauchenia decora5 Leidy 1856 oreodont "southwest end of 66 Mountain" in the "upper Gering"
"Pithecistes altageringensis" = Leptauchenia decora5 Leidy 1856 oreodont "S. side of 66 Mountain" in the "upper" Gering
"Promerycochoerus hatcheri" = Desmatochoerus hatcheri3 Douglass 1907 oreodont ssp. Desmatochoerus hatcheri geringensis; includes specimen from "south side of 66 Mountain" listed by Schultz and Falkenbach 1954
"Mesoreodon megalodon" = Desmatochoerus megalodon Peterson 1907 oreodont 200 feet; see also Loomis 1933
"Desmatochoerus (Paradesmatochoerus) wyomingensis" = Mesoreodon minor4 Douglass 1903 oreodont "Gering equivalent"
"Desmatochoerus (Paradesmatochoerus) anthonyi" = Merycoidodon major5 Leidy 1853 oreodont tentatively referred
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"Plionictis sanguinarius n. sp." = Palaeogale sanguinarius
"Plionictis sanguinarius n. sp." = Palaeogale sanguinarius Loomis 1932 carnivoran "lowermost Miocene"; see Loomis 1932a
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Enhydrocyon pahinsintewakpa6 Macdonald 1963 canid CMNH specimen from the central part of 66 Mountain, with a mile of most of the MCZ localities
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Florentiamys loomisi n. sp.7
Florentiamys loomisi n. sp.7 Wood 1936 rodent ACM specimen from "Five miles SE of Hagie, along north face of 66 Mountain... Gering or Monroe Creek Formation"; see also Wahlert 1983
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