Mount Michelson (D52a) (Miocene to of the United States)

Also known as USGS D52a

Where: North Slope County, Alaska (70.0° N, 144.8° W: paleocoordinates 70.4° N, 143.2° W)

• outcrop-level geographic resolution

When: Nuwok Member (Sagavanirktok Formation), Late/Upper Miocene to Late/Upper Miocene (11.6 - 3.6 Ma)

• Fossils from interval 258 to 266 ft below top of measured section, from tallus. Section estimated to be about 7000ft thick and containing silty shale, sandstone, and mudstone occurs in Carter Creek. Fossils only found in the upper 266 feet of the section. From Arctica carteriana zone

• bed-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, concretionary, calcareous sandstone and concretionary, calcareous siltstone

• Interbedded sandstone and siltstone, with sparse calcareous concretions.

Size class: macrofossils

Reposited in the USNM

Collection methods: quarrying,

• Collections held at USNM, University of California, USGS (Washington) and USGS (Denver)

Primary reference: F.S. MacNeil. 1957. Cenozoic Megafossils of Northern Alaska. United States Geological Survey Professional Paper 294(C):99-126 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 38002: authorized by Austin Hendy, entered by Austin Hendy on 30.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative of invertebrates
Bivalvia
 Lucinida - Thyasiridae
Thyasira aff. arctica clam
Includes: Thyasira sarsii