Umiat (D305) (Pleistocene of the United States)

Also known as USGS D305

Where: North Slope County, Alaska (70.0° N, 151.6° W: paleocoordinates 70.1° N, 151.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Gubik Formation, Early/Lower Pleistocene (2.6 - 0.8 Ma)

• Blanket deposit of gravel, sand, silt, and clay called the Gubik Formation rests confortably on the Tertiary. Assigned to the Pleistocene (originally to the Pliocene).

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified sandstone and siltstone

• Fossils collected from as high as 320ft asl. Terrace deposits.
• Gravel, sand, silt, and clay.

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 38006: authorized by Austin Hendy, entered by Austin Hendy on 30.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative of invertebrates
Bivalvia
 Cardiida - Tellinidae
"Macoma calcarea" = Macoma (Macoma) calcarea
"Macoma calcarea" = Macoma (Macoma) calcarea Gmelin 1792 tellin clam
 Hiatellida - Hiatellidae
"Saxicava arctica" = Hiatella (Hiatella) arctica
"Saxicava arctica" = Hiatella (Hiatella) arctica Linnaeus 1767 clam
Gastropoda
 Sorbeoconcha - Turritellidae
Tachyrhynchus erosus Couthouy 1838 turret shell
Subspecies: Tachyrhynchus erosus major
  - Neptuneidae