Plunkett-Parson's Locality (Oligocene of the United States)

Where: Sioux County, Nebraska (42.4° N, 103.8° W: paleocoordinates 43.6° N, 95.7° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Orella Member (Brule Formation), Orellan (33.9 - 33.3 Ma)

Environment/lithology: terrestrial

Primary reference: J. A. Lillegraven, M. C. McKenna, and L. Kristalka. 1981. Evolutionary relationships of middle Eocene and younger species of Centetodon (Mammalia, Insectivora, Geolabididae) with a description of the dentition of Ankylodon (Adapisoricidae). University of Wyoming Publication 45:1-115 [J. Alroy/J. Alroy/M. Uhen]more details

PaleoDB collection 17159: authorized by John Alroy, entered by John Alroy on 15.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• "early Frick collections... labeled as '10 miles north of Harrison, west end'": Wang 1994
divided into four levels by three "banded layers": Wang 1994; Prothero 1996c explains that this cannot be equated to the UNSM A/B/C/D scheme because the lithostratigraphy is too different
Mammalia
 Carnivora - Amphicyonidae
Daphoenus sp.1 Leidy 1853 bear-dog
Orella Mbr., Plunkett-Parsons Ranch area, N of Harrison
 Carnivora - Canidae
Hesperocyon gregarius4 Cope 1873 canid
from second, third, and fourth levels; also present at "west end"; said by Wang to probably include UNSM specimen from Munson Ranch "7-8 mi north of Harrison"
 Artiodactyla - Camelidae
Paratylopus labiatus2 Cope 1881 camel
"Munson Ranch, Sioux Co. ... 30-90 feet above PWL"
Poebrotherium wilsoni2 Leidy 1847 camel
"Munson Ranch, Sioux Co. ... early Orellan"
 Theriamorpha - Geolabididae
Centetodon marginalis Cope 1873 placental
between lower and middle banded layers, i.e., second level
 Rodentia - Eomyidae
"Paradjidaumo cf. trilophus" = Adjidaumo trilophus3
"Paradjidaumo cf. trilophus" = Adjidaumo trilophus3 Cope 1873 rodent
Plunkett Locality, Parsons Ranch