UNSM Sx-14 (Orella D) (Oligocene of the United States)

Also known as Meng Ranch, in part

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 17242: authorized by John Alroy, entered by John Alroy on 05.08.1996

Creative Commons license: CC BY (attribution)

Taxonomic list

• secs 7, 18 T33N R53W and sec 12 T33N R54W
Mammalia
 Perissodactyla - Tapiridae
? Colodon cingulatus8 Douglass 1902 tapir
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
 Rodentia - Florentiamyidae
Ecclesimus tenuiceps4 Galbreath 1948 rodent
Orella D
 Rodentia -
Diplolophus insolens2 Troxell 1923 rodent
"Orella C3" = D according to Schultz and Stout 1955
 Rodentia - Aplodontidae
Prosciurus parvus n. sp.5, "Campestrallomys annectens n. sp." = Ninamys annectens5, Pelycomys cf. placidus3, "Prosciurus relictus" = Altasciurus relictus5
Prosciurus parvus n. sp.5 Korth 1989 mountain beaver
Orella D
"Campestrallomys annectens n. sp." = Ninamys annectens5 Korth 1989 mountain beaver
Orella D
Pelycomys cf. placidus3 Galbreath 1953 mountain beaver
Orella D; see also Korth 1989c
"Prosciurus relictus" = Altasciurus relictus5 Cope 1873 mountain beaver
Orella D
 Rodentia - Sciuridae
Cedromus wardi6 Wilson 1949 squirrel
Orella D
 Rodentia - Heliscomyidae
Heliscomys vetus4 Cope 1873 rodent
Orella D
Heliscomys hatcheri4 Wood 1935 rodent
Orella D
 Rodentia - Eomyidae
Adjidaumo minutus4 Cope 1873 rodent
Orella D
"Namatomys" sp.4 Black 1965 rodent
Orella D; said to be the same genus as "N." fantasma, but probably Namatomys sensu stricto according to Chiment and Korth 1996
 Rodentia - Ischyromyidae
Ischyromys typus1 Leidy 1856 rodent