Mount Michelson (7068a) (Miocene to of the United States)

Also known as USGS 7068a

Where: North Slope County, Alaska (70.0° N, 144.7° W: paleocoordinates 70.5° 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)

• Top of section to 30 ft below. 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

• Fine consolidated silt from top of section to 30 ft below. Formation otherwise: 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 37990: authorized by Austin Hendy, entered by Austin Hendy on 30.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative of invertebrates
 Sessilia - Balanidae
Balanus crenatus Bruguière 1789 barnacle
 Carditida - Astartidae
 Carditida - Carditidae
"Cardita (Cyclocardia) nuwokensis" = Cyclocardia
"Cardita (Cyclocardia) nuwokensis" = Cyclocardia clam
 Cardiida - Arcticidae
 Hiatellida - Hiatellidae
"Cyrtodaria camdenensis" = Cyrtodaria kurriana
"Cyrtodaria camdenensis" = Cyrtodaria kurriana Dunker 1861 clam