Mount Michelson (7231) (Miocene to of the United States)

Also known as USGS 7231

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)

• 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; 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 37991: authorized by Austin Hendy, entered by Austin Hendy on 30.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative of invertebrates
Maxillopoda
 Sessilia - Balanidae
Balanus crenatus Bruguière 1789 barnacle
Bivalvia
 Carditida - Astartidae
? Astarte sp. Sowerby 1816 clam
 Cardiida - Arcticidae
 Cardiida - Tellinidae
"Macoma cf. calcarea" = Macoma (Macoma) calcarea
"Macoma cf. calcarea" = Macoma (Macoma) calcarea Gmelin 1792 tellin clam
 Cardiida - Cardiidae
? Serripes sp. Gould 1841 cockle
Gastropoda
 Neogastropoda - Buccinidae
? Colus sp. Röding 1798 true whelk