Huerfano VIII (Eocene of the United States)

Also known as Costillo Pocket; Castillo Pocket; Eohippus Quarry; Simpson's Quarry

Where: Huerfano County, Colorado (37.8° N, 105.1° W: paleocoordinates 42.2° N, 89.4° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Huerfano Formation, Wasatchian (55.8 - 50.3 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 15652: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Terri Cleary, Patricia Holroyd and Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• originally Lysitean, Lostcabinian in Gingerich 1981
 Squamata - Anguidae
Glyptosaurus sylvestris7 Marsh 1871 squamates
AMNH 7590, complete right frontal, parietal, right jugal, posterior part of right ramus and part of left surangular, body and cephalic osteoderms and unidentified bone fragments. From "Simpson's Quarry, near Gardner... 1952"- most likely Castillo Pocket, discovered at this time
Proglyptosaurus huerfanensis n. gen. n. sp.8 Sullivan 1989 squamates
AMNH 7431, complete skull
 Theriamorpha - Leptictidae
Palaeictops bicuspis Cope 1880 eutherian
 Condylarthra - Hyopsodontidae
Hyopsodus wortmani Osborn 1902 condylarth
OK according to Redline 1997
 Theriamorpha -
Talpavus sp.5 Marsh 1872 placental
 Perissodactyla - Equidae
Eohippus angustidens3 Cope 1875 horse
"Hyracotherium vasacciense vasacciense": i.d. repeated by Gingerich 1981
Xenicohippus osborni2 Bown and Kihm 1981 horse
 Artiodactyla - Diacodexeidae
Diacodexis kelleyi6 Krishtalka and Stucky 1985 even-toed ungulate
 Theriamorpha - Viverravidae
Didymictis sp.1 Cope 1875 placental
 Rodentia - Ischyromyidae
"Leptotomus costilloi n. sp." = Notoparamys costilloi
"Leptotomus costilloi n. sp." = Notoparamys costilloi Wood 1962 rodent
ref 6294: see Wood 1962
 Primates - Microsyopidae
Microsyops latidens4 Cope 1882 primate
 Cimolesta - Esthonychidae
Esthonyx acutidens Cope 1881 tillodont
 Cimolesta - Coryphodontidae
Coryphodon sp. Owen 1845 pantodont