PBDB Collection

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/M. Uhen]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.

Show authors, comments, and common names

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. Coryphodon sp. Owen 1845 pantodont
Cimolesta - Apatemyidae	Apatemys rodens Apatemys rodens Troxell 1923 eutherian
Cimolesta - Esthonychidae	Esthonyx bisulcatus Esthonyx bisulcatus Cope 1874 tillodont
Macroscelidea - Amphilemuridae	Macrocranion nitens Macrocranion nitens Matthew 1918 elephant shrew
Macroscelidea - Apheliscidae	Apheliscus sp. Apheliscus sp. Cope 1875 elephant shrew said to be new
Condylarthra - Hyopsodontidae	Hyopsodus sp.¹, Hyopsodus cf. minor Hyopsodus sp.¹ Leidy 1870 condylarth Hyopsodus cf. minor Loomis 1905 condylarth
Primates - Paromomyidae	Phenacolemurinae indet.¹ Phenacolemurinae indet.¹ Simpson 1955 primate
Primates - Omomyidae	Absarokius abbotti Absarokius abbotti Loomis 1906 tarsier also at Y-40: Bown and Rose 1987
Primates - Microsyopidae	Microsyops latidens Microsyops latidens Cope 1882 primate
Primates - Notharctidae	Cantius abditus, cf. Copelemur sp. Cantius abditus Gingerich and Simons 1977 primate cf. Copelemur sp. Gingerich and Simons 1977 primate
Rodentia - Ischyromyidae	cf. Paramys sp. cf. Paramys sp. Leidy 1871 rodent
Ferae - Metacheiromyidae	Palaeanodon ignavus Palaeanodon ignavus Matthew 1918 placental
Creodonta - Oxyaenidae	Oxyaenidae indet.¹ Oxyaenidae indet.¹ Cope 1877 creodont
Creodonta -	Prolimnocyon sp. Prolimnocyon sp. Matthew and Granger 1915 creodont
Creodonta - Hyaenodontidae	Prototomus sp., Tritemnodon cf. strenuus¹ Prototomus sp. Cope 1874 creodont Tritemnodon cf. strenuus¹ Cope 1875 creodont
Ferae -	Vulpavus sp., Miacis cf. exiguus Vulpavus sp. Marsh 1871 placental Miacis cf. exiguus Matthew and Granger 1915 placental
Ferae - Viverravidae	Viverravus cf. acutus, Didymictis sp. Viverravus cf. acutus Matthew and Granger 1915 placental Didymictis sp. Cope 1875 placental
Tribosphenida - Phenacodontidae	Phenacodus vortmani, Copecion brachypternus¹ Phenacodus vortmani Cope 1880 condylarth Copecion brachypternus¹ Cope 1882 condylarth
Perissodactyla -	Heptodon calciculus Heptodon calciculus Cope 1880 odd-toed ungulate
Perissodactyla - Helaletidae	Helaletidae indet. Helaletidae indet. Osborn 1892 odd-toed ungulate new helaletid of Bown
Perissodactyla - Palaeotheriidae	Hyracotherium sp. Hyracotherium sp. Owen 1841 odd-toed ungulate
Procreodi - Arctocyonidae	Anacodon ursidens, Thryptacodon cf. antiquus¹, Chriacus sp. Anacodon ursidens Cope 1882 condylarth Thryptacodon cf. antiquus¹ Matthew and Granger 1915 condylarth Chriacus sp. Cope 1883 condylarth said to be new
Artiodactyla - Diacodexeidae	Diacodexis metsiacus, Bunophorus sp. Diacodexis metsiacus Cope 1882 even-toed ungulate Bunophorus sp. Sinclair 1914 even-toed ungulate
Tribosphenida - Pantolestoidae	Palaeosinopa veterrima Palaeosinopa veterrima Matthew 1901 placental
Leptictida - Leptictidae	Didelphodus absarokae Didelphodus absarokae Cope 1881 eutherian

¹Alroy 2002; ²Hutchison 1991