Columbia (USGS 15280) - Hickman (1980) (Eocene of the United States)

Also known as USGS 15280

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)

• Upper part of middle member. 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 40199: 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
Bivalvia
 Cardiida - Tellinidae
Moerella quasimacoma2 Hickman 2015 tellin clam
 Cardiida - Cardiidae
Anechinocardium weaveri2 Anderson and Martin 1914 cockle
Gastropoda
 Ptenoglossa - Epitoniidae
Epitonium (Boreoscala) condoni Dall 1909 wentletrap
"Amaea (Scalina) aff. dickersoni" = Scalina wentletrap
 Patellogastropoda - Lottiidae
"Acmaea vokesi n. sp." = Patelloida vokesi
"Acmaea vokesi n. sp." = Patelloida vokesi Hickman 1980 limpet
  - Siphonaliidae
 Opisthobranchia - Cylichnidae
Scaphander stewarti Durham 1944 snail
Scaphander impunctatus Hickman 1980 snail
 Neogastropoda - Fasciolariidae
Fusinus sp. Rafinesque 1815 snail
 Neogastropoda - Cancellariidae
 Neogastropoda - Costellariidae
Conomitra vernoniana n. sp. Hickman 1980 ribbed mitre
 Neogastropoda - Ptychatractidae
Exilia bentsonae n. sp. Hickman 1980 snail
 Neogastropoda - Turridae
Turricula keaseyensis1 Hickman 1976 turrid
Procerapex bentsonae1 Durham 1944 turrid
Turrinosyrinx cf. packardi1 Weaver 1916 turrid
Acamptogenotia (Acamptogenotia) nodulosa n. sp.1 Hickman 1976 turrid
Ptychosyrinx facula1 Hickman 1976 turrid
 Neogastropoda - Conidae
Conus armentrouti Hickman 1980 cone shell
 Neogastropoda - Pseudomelatomidae
Comitas (Boreocomitas) monile n. sp.1 Hickman 1976 snail
 Naticoidea - Naticidae
Natica (Natica) weaveri Tegland 1933 moon snail
Sinum obliquum Gabb 1864 moon snail
Polinices (? Euspira) clementensis Hanna 1927 moon snail
Polinices (Euspira) nuciformis Gabb 1864 moon snail
 Tonnoidea - Bursidae
Olequahia schencki Durham 1944 frog shell
 Tonnoidea - Cassidae
Echinophoria dalli Dickerson 1917 snail