Also known as UNSM Dw-123
Where: Dawes County, Nebraska (42.6° N, 103.3° W)
• Paleocoordinates: 47.2° N, 92.8° W (Wright 2013)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Coffee Mill Butte Beds Formation (Arikaree Group), Harrisonian (23.1 - 18.5 Ma)
• "late late Arikareean" (= Harrisonian)
• bed-level stratigraphic resolution
Environment/lithology: eolian; volcaniclastic, shelly/skeletal, brown sandstone
Size class: mesofossils
Reposited in the UNSM
Collection methods: quarrying,
• "in situ concentration of vertebrate debris... Less than 2.3 kg of concentrate, composed of roughly 25 percent vertebrate tooth and bone fragments... microfauna. Reptile elements including dentaries were abundant, however, no fish, amphibian, or bird remains were recovered. Small mammals are represented by 11 jaw framgents with one or more teeth and 207 isolated cheek teeth."
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 69806: authorized by John Alroy, entered by John Alroy on 07.03.2007
Creative Commons license: CC0 (CC0)
Taxonomic list
Mammalia | |
? Archaeolagus sp. Dice 1917 rabbit | |
Gripholagomys lavocati Green 1972 pika | |
Schaubeumys sp. Wood 1935 jumping mouse | |
Promylagaulus riggsi McGrew 1941 rodent | |
Hitonkala sp. Macdonald 1963 rodent
Florentiamys sp. Wood 1936 rodent | |
Entoptychus grandiplanus Korth 1992 rodent | |
"Tamiini indet." = Marmotini
"Tamiini indet." = Marmotini squirrel | |
Leidymys sp. Wood 1936 rodent | |
Dikkomys matthewi Wood 1936 rodent
cf. Mookomys sp. Wood 1931 rodent
Proheteromys sp. Wood 1932 rodent | |
Palaeocastor sp. Leidy 1869 beaver | |
Parvericius sp. Koerner 1940 hedgehog | |
? Scalopoides sp. Wilson 1960 mole | |
Proscalops secundus Matthew 1909 placental | |
Herpetotherium youngi McGrew 1937 marsupial |