Columbia (USGS 25032) - Hickman (1980) (Eocene of the United States)

Also known as USGS 25032

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

• coordinate stated in text

• 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)Exhaustive for gastropoda

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 40204: authorized by Austin Hendy, entered by Austin Hendy on 19.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Ptenoglossa - Epitoniidae
 Neogastropoda - Fasciolariidae
Perse aff. pittsburgensis Durham 1944 snail
 Neogastropoda - Costellariidae
 Neogastropoda - Muricidae
"Trophonopsis platacantha" = Trophon (Trophonopsis)
"Trophonopsis platacantha" = Trophon (Trophonopsis) murex snail
 Neogastropoda - Turridae
 Neogastropoda - Pseudomelatomidae
 Naticoidea - Naticidae
Natica (Natica) weaveri Tegland 1933 moon snail
Polinices (? Euspira) clementensis Hanna 1927 moon snail
Polinices (Euspira) nuciformis Gabb 1864 moon snail
 Tonnoidea - Ranellidae
 Tonnoidea - Cassidae
Echinophoria dalli Dickerson 1917 snail
 Sorbeoconcha - Turritellidae
 Seguenzioidea - Calliotropidae
Bathybembix nitor Hickman 1980 snail