Skarboe Spur (Oligocene of the United States)

Also known as UNSM Mo-163

Where: Morrill County, Nebraska (41.7° N, 103.0° W: paleocoordinates 42.6° N, 97.2° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Arikaree Group, Monroecreekian (26.3 - 24.8 Ma)

• "late early Arikareean" (= Monroecreekian)

•"Monroe Creek/Harrison formations, undifferentiated... middle Arikaree Group"

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial; volcaniclastic sandstone

• "Harvester Ant hill built on massive volcaniclastic sandstone"

Size class: mesofossils

Reposited in the UNSM

Collection methods: bulk, anthill, sieve,

• rock censused consists of "concentrate," not the original sediment

Primary reference: B. E. Bailey. 2004. Biostratigraphy and biochronology of early Arikareean through late Hemingfordian small mammal faunas from the Nebraska Panhandle and adjacent areas. Paludicola 4(3):81-113 [J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 67637: authorized by John Alroy, entered by John Alroy on 29.11.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Reptile remains were fairly common... no fish, amphibian, or bird elements"
Mammalia
 Rodentia - Cricetidae
Paciculus nebraskensis Alker 1969 mouse
 Rodentia - Sciuridae
"Tamiini indet." = Marmotini, Protospermophilus sp.
"Tamiini indet." = Marmotini squirrel
Protospermophilus sp. Gazin 1930 squirrel
 Rodentia - Geomyidae
Gregorymys formosus Matthew 1907 pocket gopher
 Rodentia - Florentiamyidae
Hitonkala macdonaldtau Korth 1992 rodent
? Florentiamys sp. Wood 1936 rodent
 Rodentia - Heteromyidae
Proheteromys sp. Wood 1932 rodent
Schizodontomys cf. harkseni Macdonald 1970 rodent
 Rodentia - Castoridae
Palaeocastor sp. Leidy 1869 beaver
 Rodentia - Allomyidae
Alwoodia sp. Rensberger 1983 rodent
 Rodentia - Mylagaulidae
Promylagaulus riggsi McGrew 1941 rodent
 Lagomorpha - Leporidae
Palaeolagus philoi Dawson 1958 rabbit
 Lagomorpha - Ochotonidae
Gripholagomys lavocati Green 1972 pika
 Tribosphenida - Proscalopidae
Proscalops secundus Matthew 1909 placental
 Theriiformes - Herpetotheriidae
Herpetotherium sp. Cope 1873 marsupial