Columbia (USGS 15284) - Hickman (1980) (Eocene to of the United States)

Also known as USGS 15284

Where: Columbia County, Oregon (45.8° N, 123.3° W: paleocoordinates 45.7° N, 111.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Lower Member (Keasey Formation), Priabonian to Priabonian (38.0 - 28.1 Ma)

• Lower member consists of 0-150 m of dark gray, highly micaceous, laminated siltstone and interbedded mudsone. Glaucontitc layers are not uncommon. The Keasey Formation consists of a maximum of 700 m of gray tuffaceous marine siltstone and massive mudstone discontinuously exposed in quaries, road and railway cuts, and along major drainages. The Keasey Fm overlies the late Eocene Cowlitz Fm, and underlies the Pittsburg Bluff Fm. Fm is subdivided into three informal members.

• bed-level stratigraphic resolution

Environment/lithology: deep-water; micaceous, gray siltstone and mudstone

• No general geologic data provided
• Dark gray, highly micaceous, laminated siltstone and interbedded mudstone

Size class: macrofossils

Reposited in the USNM

Collection methods: quarrying,

• USGS collections are reposited in USNM. Other collections are reposited at Stanford University (SU), UC Berkeley Museum of Paleontology (UCMP), Cal. Acad. Sci. (CAS), Oregon State Dept. of Geology and Mineral Industries (DOGAMI)

Primary reference: C. S. Hickman. 1980. Paleogene Marine Gastropods of the Keasey Formation in Oregon. Bulletins of American Paleontology 78(310):1-112 [L. Ivany/E. Kowalski]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39949: authorized by Austin Hendy, entered by Austin Hendy on 12.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda
Gastropoda
 Patellogastropoda - Lottiidae
"Acmaea vokesi" = Patelloida vokesi
"Acmaea vokesi" = Patelloida vokesi Hickman 1980 limpet
 Neogastropoda - Turridae
 Naticoidea - Naticidae
Natica (Natica) weaveri Tegland 1933 moon snail