Opal (UW 3-67) (Eocene of the United States)

Where: Lincoln County, Wyoming (41.8° N, 110.3° W: paleocoordinates 45.8° N, 96.5° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• bed-level stratigraphic resolution

Environment/lithology: fluvial; tuff

• white tuff bed... typically varies between 3 to 8 feet in thickness... very fine-grained and highly altered and in places interbedded in the tuff are laminated siltstones

Reposited in the UW

Primary reference: P. O. McGrew and R. Sullivan. 1971. The stratigraphy and paleontology of Bridger A. Contributions to Geology, University of Wyoming 9(2):66-85 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 16357: authorized by John Alroy, entered by John Alroy on 21.09.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Orohippus pumilus" is listed in a table but no specimen is described
Mammalia
 Primates - Notharctidae
Notharctus robinsoni2 Gingerich 1979 primate
Smilodectes mcgrewi2 Gingerich 1979 primate
 Rodentia - Sciuravidae
Sciuravus nitidus Marsh 1871 rodent
 Carnivora -
Vulpavus sp.1 Marsh 1871 carnivoran
 Hyaenodonta - Hyaenodontidae
Sinopa rapax Leidy 1871 eutherian
placed at this locality in the text, but listed at UW 1-67 in a table
 Theriiformes - Herpetotheriidae
"Herpetotherium cf. marsupium" = Peratherium marsupium1
"Herpetotherium cf. marsupium" = Peratherium marsupium1 Troxell 1923 marsupial