Columbia (USGS 15268) - Hickman (1980) (Eocene of the United States)

Also known as USGS 15268

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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40182: authorized by Austin Hendy, entered by Austin Hendy on 19.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda
 Ptenoglossa - Epitoniidae
Epitonium (Boreoscala) condoni Dall 1909 wentletrap
 Neogastropoda - Buccinidae
 Neogastropoda - Cancellariidae
 Neogastropoda - Costellariidae
 Neogastropoda - Muricidae
"Trophonopsis platacantha" = Trophon (Trophonopsis)
"Trophonopsis platacantha" = Trophon (Trophonopsis) murex snail
 Neogastropoda - Ptychatractidae
Exilia bentsonae Hickman 1980 snail
 Neogastropoda - Turridae
 Naticoidea - Naticidae
Polinices (Euspira) nuciformis Gabb 1864 moon snail
 Tonnoidea - Ranellidae
Argobuccinum jeffersonense, ""Fusitriton" terrysmithae" = Ameranella terrysmithae
""Fusitriton" terrysmithae" = Ameranella terrysmithae Hickman 1980 triton shell
 Tonnoidea - Bursidae
 Tonnoidea - Cassidae
Echinophoria dalli Dickerson 1917 snail