USGS 22493 - Utukok River, North Slope (Cretaceous of the United States)

Also known as Loc. #26; 50ASa267

Where: North Slope County, Alaska (68.5° N, 161.1° W: paleocoordinates 76.3° N, 35.7° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Okipruak Formation, Valanginian (139.8 - 132.9 Ma)

• Okipruak Formation, basal part. Valanginian in age.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, gray shale and gray siltstone

• Shallow water, possibly even littoral.
• Dark-gray silty shale, siltstone, and conglomerate.

Size class: macrofossils

Reposited in the USNM

Collection methods: quarrying,

• Collected by E.G. Sable, 1950. Collections held in USGS and USNM.

Primary reference: R. W. Imlay. 1961. Characteristic lower Cretaceous megafossils from northern Alaska. United States Geological Survey Professional Paper 335 [A. Miller/A. Hendy/M. Clapham]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 44383: authorized by Austin Hendy, entered by Austin Hendy on 09.09.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative, but not exhaustive. Depauperate fauna.
Bivalvia
 Pectinida - Buchiidae
"Aucella crassicollis" = Buchia crassicollis
"Aucella crassicollis" = Buchia crassicollis Keyserling 1846 scallop