UNSM Sx-17 (Orella D) (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 D Member (Brule Formation), Orellan (33.9 - 33.3 Ma)

Environment/lithology: terrestrial

Reposited in the UNSM

Primary reference: T. H. Heaton. 1993. The Oligocene Rodent Ischyromys of the Great Plains: Replacement Mistaken for Anagenesis. Journal of Paleontology 67(2) [J. Alroy/J. Alroy/J. Ju]more details

PaleoDB collection 17250: authorized by John Alroy, entered by John Alroy on 05.08.1996

Creative Commons license: CC BY (attribution)

Taxonomic list

• sec 8 T33N R53W: Martin 1992
Mammalia
 Rodentia - Aplodontidae
Prosciurus magnus5, "Campestrallomys annectens" = Ninamys annectens5
Prosciurus magnus5 Korth 1989 mountain beaver
Orella D
"Campestrallomys annectens" = Ninamys annectens5 Korth 1989 mountain beaver
Orella D
 Rodentia - Sciuridae
Cedromus wardi6 Wilson 1949 squirrel
Orella D
Protosciurus mengi3 Black 1963 squirrel
Orella D
 Rodentia - Ischyromyidae
Ischyromys typus1 Leidy 1856 rodent
 Rodentia - Heliscomyidae
Heliscomys hatcheri4, Heliscomys vetus4, "Heliscomys mcgrewi n. sp." = Megaheliscomys mcgrewi4
Heliscomys hatcheri4 Wood 1935 rodent
Orella D; type also could be from this locality, as it is from Cottonwood Creek in Sioux Co.
Heliscomys vetus4 Cope 1873 rodent
Orella D
"Heliscomys mcgrewi n. sp." = Megaheliscomys mcgrewi4 Korth 1989 rodent
Orella D
 Rodentia - Geomyidae
? Tenudomys basilaris n. sp.4 Korth 1989 pocket gopher
Orella D
 Rodentia - Eomyidae
"Paradjidaumo trilophus" = Adjidaumo trilophus4
"Paradjidaumo trilophus" = Adjidaumo trilophus4 Cope 1873 rodent
Orella D
 Rodentia -
Diplolophus insolens2 Troxell 1923 rodent
"Orella C3" = D according to Schultz and Stout 1955
 Rodentia - Florentiamyidae
Ecclesimus tenuiceps4 Galbreath 1948 rodent
Orella D
 Lagomorpha - Leporidae
Megalagus turgidus7 Cope 1873 rabbit
Orella D
Palaeolagus haydeni7 Leidy 1856 rabbit
Orella D
Palaeolagus burkei7 Schlaikjer 1935 rabbit
Orella D