Columbia (USGS 15279) - Hickman (1980) (Eocene of the United States)

Also known as USGS 15279

Where: Columbia County, Oregon (45.8° N, 123.3° W: paleocoordinates 46.1° N, 111.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Middle Member (Keasey Formation), Priabonian (38.0 - 33.9 Ma)

• Middle member includes 500 m of predominantly light gray highly tuffaceous siltstone and mudstone beds with occasional ash layers and calcaerous concretionary beds. 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; poorly lithified, concretionary, tuffaceous, gray, calcareous siltstone and concretionary, tuffaceous, gray, calcareous mudstone

• No general geologic data provided
• Predominantly light gray highly tuffaceous siltstone and mudstone beds with occasional ash layers and calcaerous concretionary beds

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/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40184: authorized by Austin Hendy, entered by Austin Hendy on 19.06.2004, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda
Gastropoda
 Epitonioidea - Epitoniidae
Epitonium (Boreoscala) wyattdurhami Hickman 1980 wentletrap
 Neogastropoda - Clavatulidae
Turricula keaseyensis1 Hickman 1976 snail
 Neogastropoda - Turridae
Procerapex bentsonae1 Durham 1944 turrid
 Neogastropoda - Ptychatractidae
Exilia bentsonae Hickman 1980 snail
 Neogastropoda - Cancellariidae
 Sorbeoconcha - Bursidae
Olequahia schencki Durham 1944 frog shell
 Sorbeoconcha - Naticidae
Natica (Natica) weaveri Tegland 1933 moon snail
 Opisthobranchia - Cylichnidae
Scaphander impunctatus Hickman 1980 snail
Bivalvia
 Thraciida - Periplomatidae
"Aperiploma bainbridgensis" = Cochlodesma bainbridgensis2
"Aperiploma bainbridgensis" = Cochlodesma bainbridgensis2 Clark 1925 clam
 Cardiida - Cardiidae
Anechinocardium weaveri3 Anderson and Martin 1914 cockle
 Cardiida - Tellinidae
Moerella quasimacoma3 Hickman 2015 tellin clam