Chriacus Locality (Eocene of the United States)

Also known as USGS D-1162, YPM 40

Where: Big Horn County, Wyoming (44.5° N, 108.0° W: paleocoordinates 49.2° N, 90.8° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Willwood Formation, Wasatchian (55.8 - 50.3 Ma)

Environment/lithology: terrestrial

Primary reference: T. M. Bown, K. D. Rose, E. L. Simons and S. L. Wing. 1994. Distribution and stratigraphic correlation of upper Paleocene and lower Eocene fossil mammal and plant localities of the Fort Union, Willwood, and Tatman formations, southern Bighorn Basin, Wyoming. United States Geological Survey Professional Paper 1540:1-103 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 15552: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Patricia Holroyd

Creative Commons license: CC BY (attribution)

Taxonomic list

• placed in Schankler-Wing section by Bown et al.
level given as 560 m by Bown and Rose 1987, correctly using Schankler meter level, but incorrectly as 481 m by Bown et al.
Reptilia
 Testudines - Kinosternoidea
Baltemys staurogastros n. gen. n. sp.2
Baltemys staurogastros n. gen. n. sp.2 Hutchison 1991 mud turtle
Mammalia
 Cimolesta - Coryphodontidae
Coryphodon sp. Owen 1845 pantodont
 Cimolesta - Esthonychidae
Esthonyx bisulcatus Cope 1874 tillodont
 Cimolesta - Pantolestidae
Palaeosinopa veterrima Matthew 1901 eutherian
 Primates - Microsyopidae
Microsyops latidens Cope 1882 primate
 Primates - Omomyidae
Absarokius abbotti Loomis 1906 tarsier
also at Y-40: Bown and Rose 1987
 Primates - Notharctidae
cf. Copelemur sp. Gingerich and Simons 1977 primate
Cantius abditus Gingerich and Simons 1977 primate
 Primates - Paromomyidae
Phenacolemurinae indet.1 Simpson 1955 primate
 Rodentia - Ischyromyidae
cf. Paramys sp. Leidy 1871 rodent
 Condylarthra - Hyopsodontidae
Hyopsodus sp.1 Leidy 1870 condylarth
Hyopsodus cf. minor Loomis 1905 condylarth
 Tribosphenida - Phenacodontidae
Copecion brachypternus1 Cope 1882 condylarth
Phenacodus vortmani Cope 1880 condylarth
 Perissodactyla -
Heptodon calciculus Cope 1880 odd-toed ungulate
 Perissodactyla - Helaletidae
Helaletidae indet. Osborn 1892 odd-toed ungulate
new helaletid of Bown
 Perissodactyla - Palaeotheriidae
Hyracotherium sp. Owen 1841 odd-toed ungulate
 Creodonta - Oxyaenidae
Oxyaenidae indet.1 Cope 1877 creodont
 Ferae - Viverravidae
Didymictis sp. Cope 1875 placental
Viverravus cf. acutus Matthew and Granger 1915 placental
 Carnivora - Miacidae
Miacis cf. exiguus Matthew and Granger 1915 carnivoran
 Carnivora -
Vulpavus sp. Marsh 1871 carnivoran
 Ferae - Metacheiromyidae
Palaeanodon ignavus Matthew 1918 placental
 Macroscelidea - Apheliscidae
Apheliscus sp. Cope 1875 elephant shrew
said to be new
 Macroscelidea - Amphilemuridae
Macrocranion nitens Matthew 1918 elephant shrew
 Tribosphenida - Arctocyonidae
Anacodon ursidens Cope 1882 condylarth
Thryptacodon cf. antiquus1 Matthew and Granger 1915 condylarth
Chriacus sp. Cope 1883 condylarth
said to be new
 Hyaenodonta -
Prolimnocyon sp. Matthew and Granger 1915 eutherian
 Hyaenodonta - Hyaenodontidae
Prototomus sp. Cope 1874 eutherian
Tritemnodon cf. strenuus1 Cope 1875 eutherian
 Hyaenodonta -
Didelphodus absarokae Cope 1881 eutherian
 Artiodactyla - Diacodexeidae
Bunophorus sp. Sinclair 1914 even-toed ungulate
Diacodexis metsiacus Cope 1882 even-toed ungulate
 Sarcobora - Apatemyidae
Apatemys rodens Troxell 1923 insectivoran