Pocket Mouse Burrows (Miocene of the United States)

Where: Antelope County, Nebraska (42.4° N, 98.1° W: paleocoordinates 42.8° N, 95.5° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Merritt Dam Member (Ash Hollow Formation), Late/Upper Clarendonian (13.6 - 10.3 Ma)

• single sandstone bed "about 1 m thick"; shown above Bluejay Quarry (Merritt Dam Member) in the upper Ash Hollow Formation

• bed-level stratigraphic resolution

Environment/lithology: fine channel fill; silty sandstone

• "broad shallow stream"
• lenticular body of obscurely laminated, poorly sorted silty sandstone

Size class: mesofossils

Collection methods: bulk, chemical, sieve,

• burrow fillings "soaked... in water and detergent until disaggregated, and then screened... using 25-mesh screen"

Primary reference: M. R. Voorhies. 1974. Fossil pocket mouse burrows in Nebraska. American Midland Naturalist 91(2):492-498 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 37802: authorized by John Alroy, entered by John Alroy on 24.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Rodentia - Heteromyidae
Perognathus sp. Maximillian 1839 pocket mouse
"sensu lato"
Dicotyledonae
 Urticales - Dilleniidae
Celtis sp. Linnaeus 1753 hackberry
plus "silicified roots, stems" and grass seeds