Also known as UNSM Dw-123

Where: Dawes County, Nebraska (42.6° N, 103.3° W: paleocoordinates 43.4° N, 98.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Coffee Mill Butte Beds Formation (Arikaree Group), Harrisonian (24.8 - 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: CC BY (attribution)