Columbia (USGS 15601) - Hickman (1980) (Eocene of the United States)

Also known as USGS 15601

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

• Upper member consists of 50 m of alternating light to dark tuffaceous siltstone and mudstone characterized by numerous well-indurated calcaerous beds and concretionary siltstone layers. 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
• Alternating light to dark gray tuffaceous siltstone and mudstone characterized by numerous well-indurated calcaerous beds and concretionary siltstone layers

Size class: macrofossils

Preservation: concretion

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 40202: authorized by Austin Hendy, entered by Austin Hendy on 19.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda
Gastropoda
 Cephalaspidea - Cylichnidae
 Neogastropoda - Costellariidae
 Neogastropoda - Muricidae
"Trophonopsis platacantha" = Trophon (Trophonopsis)
"Trophonopsis platacantha" = Trophon (Trophonopsis) murex snail
 Neogastropoda - Turridae
 Naticoidea - Naticidae
Polinices (Euspira) nuciformis Gabb 1864 moon snail
Neverita (Neverita) sp. Risso 1826 moon snail
 Tonnoidea - Cassidae
Echinophoria dalli Dickerson 1917 snail
 Sorbeoconcha - Turritellidae
Turritella keaseyensis Hickman 1980 turret shell
 Seguenzioidea - Calliotropidae
Bathybembix sp. n. sp. Crosse 1892 snail
Bathybembix nitor Hickman 1980 snail