Huerfano I (Eocene of the United States)

Also known as Huerfano Muddy Divide, Muddy Fork

Where: Huerfano County, Colorado (37.8° N, 105.1° W: paleocoordinates 41.3° N, 91.8° W)

• coordinate based on political unit

When: Huerfano Formation, Bridgerian (50.3 - 46.2 Ma)

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Primary reference: 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]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 16239: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Terri Cleary and Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• Gardnerbuttean; "Most specimens are from below the white bed (unit 20 of measured section)"
 Squamata - Anguidae
"Glyptosaurus hillsi n. sp." = Glyptosaurus sylvestris3
"Glyptosaurus hillsi n. sp." = Glyptosaurus sylvestris3 Marsh 1871 squamates
USNM 6004 (holotype), greater portion of top of skull, both maxillae with teeth, both quadrates, anterior portions of both jugals, greater portion of right ramus and portions of left; USNM 10606, parietal, skull fragments, numerous quadrangular dermal scutes - "variegated beds about 35 to 40 feet below ash beds"
 Dinocerata - Uintatheriidae
Bathyopsis sp. Cope 1881 uintathere
 Condylarthra - Hyopsodontidae
Hyopsodus paulus8 Leidy 1870 condylarth
 Perissodactyla - Hyrachyidae
Hyrachyus modestus Leidy 1870 odd-toed ungulate
 Perissodactyla -
Helaletes cf. nanus Marsh 1871 odd-toed ungulate
 Perissodactyla - Brontotheriidae
"Palaeosyops fontinalis" = Palaeosyops fontinalis, "Eometarhinus huerfanensis n. gen. n. sp." = Palaeosyops fontinalis7
"Palaeosyops fontinalis" = Palaeosyops fontinalis Cope 1873 brontothere
"Eometarhinus huerfanensis n. gen. n. sp." = Palaeosyops fontinalis7 Cope 1873 brontothere
AMNH 17103; Huerfano-Muddy Divide, three miles west of Gardner, Huerfano basin, Colorado.
 Perissodactyla - Palaeotheriidae
Hyracotherium vasacciense Cope 1872 odd-toed ungulate
"Hyracotherium vasacciense vasacciense":
 Theriamorpha - Viverravidae
Didymictis vancleveae Robinson 1966 placental
Viverravus sicarius Matthew 1909 placental
 Rodentia - Ischyromyidae
Thisbemys perditus6 Wood 1962 rodent
 Primates - Omomyidae
Strigorhysis huerfanensis n. sp.2 Bown and Rose 1987 tarsier
"Absarokius noctivagus nocerai"
 Primates - Microsyopidae
Megadelphus lundeliusi1 White 1952 primate
Microsyops cf. scottianus5 Cope 1881 primate
 Primates - Notharctidae
Smilodectes gracilis4 Marsh 1871 primate
probably includes "Notharctus nunienus"
 Cimolesta - Esthonychidae
Trogosus grangeri Gazin 1953 tillodont