Wewela Microfauna (Oligocene of the United States)

Also known as UNSM SDK-9

Where: Tripp County, South Dakota (43.1° N, 99.8° W: paleocoordinates 43.8° N, 93.9° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• "late early Arikareean" (= Monroecreekian)

•"upper third of the Turtle Butte Formation... lower Arikaree Group"

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial; unlithified, pebbly, sandy siltstone

• "fluvial, 0.3-1 m lens of sandy siltstone with poorly sorted pebble intraclasts, deposited within characteristic tuffaceous siltstones"

Size class: mesofossils

Reposited in the UNSM

Collection methods: bulk, sieve,

• rock censused includes "a small bag (14 kg) of sandy siltstone fragments" produced by dry screening, and 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 67636: authorized by John Alroy, entered by John Alroy on 29.11.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

 Siluriformes - Ictaluridae
Ictalurus sp. Rafinesque 1820 catfish
 Rodentia - Cricetidae
Paciculus sp. Cope 1879 mouse
 Rodentia - Castoridae
Palaeocastor sp. Leidy 1869 beaver
 Rodentia - Allomyidae
Alwoodia sp. Rensberger 1983 rodent
 Lagomorpha - Ochotonidae
Gripholagomys lavocati Green 1972 pika