Huerfano II: Bridgerian, Colorado

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Anguidae
Glyptosaurinae indet. Marsh 1872
Sullivan 1979 1 specimen
AMNH 7593, left dentary fragment and other bone fragments
Glyptosaurus sylvestris Marsh 1871
Sullivan 1979 1 specimen
AMNH 11045, left frontal
Paraglyptosaurus princeps (Marsh 1872)
Sullivan 1979 2 specimens
synonym of Glyptosaurus sylvestris
AMNH 7544, frontal; 7597, left maxilla
cf. Paraglyptosaurus princeps (Marsh 1872)
Sullivan 1979 4 specimens
synonym of Glyptosaurus sylvestris
AMNH 7454, right maxilla fragment; 7592, osteoderms; 7595, left dentary fragment; 7599, two parietal fragments
cf. Eoglyptosaurus donohoei (White 1952)
Sullivan 1979 1 specimen
synonym of Glyptosaurus sylvestris
AMNH 7454??? Same specimen no. given as "cf. P. princeps", so not sure which is the accurate occurrence.
Reptilia - Testudines - Trionychidae
Trionychidae indet. Gray 1825
Lichtig and Lucas 2015
UCM Loc. 77039
Reptilia - Testudines
Hadrianus corsoni (Leidy 1871)
Lichtig and Lucas 2015
UCM Loc. 77063
Peratherium sp. Aymard 1850
    = Herpetotheriinae indet. Trouessart 1879
Alroy 2002
spelled with current rank as Herpetotheriidae
Peratherium cf. comstocki Cope 1884
Simpson 1968
not the same as "? P. sp." reported by Robinson 1966a; Simpson's i.d. is confirmed by Krishtalka and Stucky 1983b
Stylinodon sp. Marsh 1874
    = Stylinodon mirus Marsh 1874
Schoch and Lucas 1981
Mammalia - Condylarthra - Hyopsodontidae
Hyopsodus paulus Leidy 1870
includes "H. wortmani": Redline 1997
Mammalia - Primates - Notharctidae
Notharctus nunienus (Cope 1881)
    = Notharctus robinsoni Gingerich 1979
Gingerich 1979
in part
Notharctus nunienus (Cope 1881)
(13 measurements)
    = Smilodectes mcgrewi Gingerich 1979
Gingerich 1979
in part
Mammalia - Primates - Omomyidae
Huerfanius rutherfurdi n. sp. Robinson 1966
    = Uintanius rutherfurdi Robinson 1966
Alroy 2002
Shoshonius cooperi Granger 1910
(1 measurement)
    = Washakius cf. izetti Honey 1990
Honey 1990
omitted from faunal list by Robinson but discussed on p. 33
Omomys carteri Leidy 1869
Stucky 1984
Absarokius noctivagus Matthew 1915
    = Absarokius nocerai n. sp. Robinson 1966
Bown and Rose 1987
"Absarokius noctivagus nocerai"
    = Artimonius nocerai Robinson 1966
Muldoon and Gunnell 2002
Mammalia - Primates - Microsyopidae
Microsyops lundeliusi (White 1952)
    = Megadelphus lundeliusi White 1952
Alroy 2002
Cynodontomys knightensis Gazin 1952
    = Microsyops cf. scottianus Cope 1881
Gunnell 1989
Mammalia - Rodentia - Sciuravidae
Paramys huerfanensis Wood 1962
    = Knightomys huerfanensis Wood 1962
Alroy 2002
may include "Microparamys sp. B" of Wood 1962, which according to Korth 1984 is a K. huerfanensis specimen from either Huerfano II, III, or V
Knightomys depressus (Loomis 1907)
Korth 1984
Mammalia - Rodentia - Ischyromyidae
Paramys copei Loomis 1907
Thisbemys nini Wood 1962
    = Thisbemys perditus Wood 1962
Korth 1984
"Leptotomus huerfanensis," and "Paramys excavatus gardneri"
Thisbemys elachistos Korth 1984
Korth 1984
(5 measurements)
Leptotomus grandis Wood 1962
    = Quadratomus grandis Wood 1962
Alroy 2002
Mammalia - Perissodactyla - Brontotheriidae
Palaeosyops fontinalis Cope 1873
Eotitanops minimus Osborn 1919
synonym of Eotitanops gregoryi
see also Gunnell and Yarborough 2000
Mammalia - Perissodactyla - Hyrachyidae
Hyrachyus modestus (Leidy 1870)
Mammalia - Perissodactyla
Helaletes cf. nanus (Marsh 1871)
Mammalia - Perissodactyla - Palaeotheriidae
Hyracotherium vasacciense (Cope 1872)
"Hyracotherium vasacciense vasacciense":
Mammalia - Diacodexeidae
Bunophorus cf. macropternus (Cope 1882)
(5 measurements)
    = Bunophorus sinclairi Guthrie 1966
Stucky and Krishtalka 1990
Mammalia - Homacodontidae
Antiacodon pygmaeus (Cope 1872)
"Antiacodon pygmaeus huerfanensis":
Mammalia - Creodonta - Hyaenodontidae
Sinopa cf. strenua (Cope 1875)
    = Tritemnodon cf. strenuus Cope 1875
Alroy 2002
Arfia sp. Van Valen 1965
Kihm 1984
Miacis parvivorus Cope 1872
Vulpavus asius Gazin 1952
    = Vulpavus canavus Cope 1881
Guthrie 1971
Uintacyon cf. asodes Gazin 1952
Mammalia - Viverravidae
Viverravus gracilis Marsh 1872
Viverravus sicarius Matthew 1909
Oodectes herpestoides Wortman 1901
Mammalia - Acreodi - Mesonychidae
Mesonyx obtusidens Cope 1872
Mammalia - Esthonychidae
Esthonyx acutidens Cope 1881
McKenna 1976
Trogosus grangeri Gazin 1953
Mammalia - Coryphodontidae
Coryphodon molestus (Cope 1874)
    = Coryphodon armatus Cope 1872
Lucas 1998
"C. sp."
Mammalia - Apatemyidae
Apatemys sp. Marsh 1872
    = Apatemyidae indet. Matthew 1909
Alroy 2002
large and small
see common names

Country:United States State/province:Colorado County:Huerfano
Coordinates: 37.8° North, 105.1° West (view map)
Paleocoordinates:41.3° North, 91.8° West
Basis of coordinate:based on political unit
Geographic resolution:small collection
Period:Paleogene Epoch:Eocene
10 m.y. bin:Cenozoic 2
Key time interval:Bridgerian
Age range of interval:50.50000 - 46.20000 m.y. ago
* legacy (obsolete) database fields
Local section:Huerf Local bed:4
Local order:bottom to top
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection size:170 specimens
Reason for describing collection:general faunal/floral analysis
Taxonomic list comments:Gardnerbuttean - "Most of specimens from unit 9 of measured section."
Also known as:Fence Hill; Fossil Creek; UCM locality 77063
Database number:16240
Authorizer:J. Alroy, P. Barrett, P. Holroyd Enterer:J. Alroy, P. Holroyd, T. Cleary
Modifier:P. Holroyd Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2024-01-07 22:49:56
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:

2921. P. Robinson. 1966. Fossil Mammalia of the Huerfano Formation, Eocene, of Colorado. Peabody Museum of Natural History Bulletin 21:1-95 [J. Alroy/J. Alroy/J. Marcot]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
1123 T. M. Bown and K. D. Rose. 1987. Patterns of Dental Evolution in Early Eocene Anaptomorphine Primates (Omomyidae) from the Bighorn Basin, Wyoming. Paleontological Society Memoir 23:1-162 [J. Alroy/J. Alroy/J. Ju]
1638 P. D. Gingerich. 1979. Phylogeny of middle Eocene Adapidae (Mammalia, Primates) in North America: Smilodectes and Notharctus. Journal of Paleontology 53(1):153-163 [J. Alroy/J. Alroy/J. Alroy]
1730 G. F. Gunnell. 1989. Evolutionary History of Microsyopoidea (Mammalia, ?Primates) and the Relationship Between Plesiadapiformes and Primates. University of Michigan Papers on Paleontology 27:1-157 [J. Alroy/J. Alroy/P. Mannion]
1761 D. A. Guthrie. 1971. The Mammalian Fauna of the Lost Cabin Member, Wind River Formation (lower Eocene) of Wyoming. Annals of Carnegie Museum 43(4):47-113 [J. Alroy/J. Alroy/J. Marcot]
1932 J. G. Honey. 1990. New Washakiin Primates (Omomyidae) from the Eocene of Wyoming and Colorado, and Comments on the Evolution of the Washakiini. Journal of Vertebrate Paleontology 10(2) [J. Alroy/J. Alroy/J. Ju]
2078 A. J. Kihm. 1984. Early Eocene Mammalian Fauna of the Piceance Creek Basin. Northwestern Colorado. [J. Alroy/J. Alroy/M. Uhen]
2105 W. W. Korth. 1984. Earliest Tertiary evolution and radiation of rodents in North America. Bulletin of Carnegie Museum of Natural History 24:1-71 [J. Alroy/J. Alroy/J. Marcot]
58369 A. J. Lichtig and S. G. Lucas. 2015. Turtles of the Eocene Huerfano Formatoin, Raton Basin, Colorado. New Mexico Museum of Natural History and Science Bulletin 67:153-160 [P. Holroyd/P. Holroyd]
6280 S. G. Lucas. 1998. Fossil mammals and the Paleocene/Eocene series boundary in Europe, North America, and Asia. In M.-P. Aubry, S. G. Lucas and W. A. Berggren (eds.), Late Paleocene–Early Eocene Biotic and Climatic Events in the Marine and Terrestrial Records 451-500 [J. Alroy/J. Alroy/M. Uhen]
2533 M. C. McKenna. 1976. Esthonyx in the Upper Faunal Assemblage, Huerfano Formation, Eocene of Colorado. Journal of Paleontology 50(2):354-355 [J. Alroy/J. Alroy/J. Ju]
3057 R. M. Schoch and S. G. Lucas. 1981. New Conoryctines (Mammalia: Taeniodonta) from the Middle Paleocene (Torrejonian) of Western North America. Journal of Mammalogy 62(4) [J. Alroy/J. Alroy/J. Ju]
3161 G. G. Simpson. 1968. A didelphid (Marsupialia) from the Early Eocene of Colorado. Postilla 115:1-3 [J. Alroy/J. Alroy/M. Carrano]
3331 R. K. Stucky. 1984. The Wasatchian-Bridgerian Land Mammal Age boundary (early to middle Eocene) in western North America. Annals of Carnegie Museum 53(12):347-382 [J. Alroy/J. Alroy/J. Alroy]
3335 R. K. Stucky and L. Krishtalka. 1990. Revision of the Wind River Faunas, Early Eocene of Central Wyoming. Part 10. Bunophorus (Mammalia, Artiodactyla). Annals of Carnegie Museum 59(2):149-171 [J. Alroy/J. Alroy/J. Marcot]
60385 R. M. Sullivan. 1979. Revision of the Paleogene genus Glyptosaurus (Reptilia, Anguidae). Bulletin of the American Museum of Natural History 163(1):1-72 [P. Barrett/T. Cleary]