Barrow (7228) (Pleistocene of the United States)

Also known as USGS 7228

Where: North Slope County, Alaska (71.4° N, 156.5° W: paleocoordinates 71.5° N, 156.2° 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, surface (float),

• 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 38012: 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 rostratus Hoek 1883 barnacle
Subspecies: Balanus rostratus alaskiensis
Bivalvia
 Carditida - Astartidae
"Astarte leffingwelli" = Astarte borealis
"Astarte leffingwelli" = Astarte borealis Chemnitz 1784 clam
 Carditida - Carditidae
"Cardita (Cyclocardia) crebricostata" = Cyclocardia (Cyclocardia) crebricostata
"Cardita (Cyclocardia) crebricostata" = Cyclocardia (Cyclocardia) crebricostata Krause 1885 clam
 Cardiida - Tellinidae
"Macoma calcarea" = Macoma (Macoma) calcarea
"Macoma calcarea" = Macoma (Macoma) calcarea Gmelin 1792 tellin clam