Columbia (USGS 15508) - Hickman (1980) (Eocene to of the United States)

Also known as USGS 15508

Where: Columbia County, Oregon (45.7° N, 123.2° W: paleocoordinates 45.6° N, 111.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Middle Member (Keasey Formation), Priabonian to Priabonian (38.0 - 28.1 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 40187: 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
 Neotaenioglossa - Calyptraeidae
Calyptraea diegoana Conrad 1855 slipper shell
 Neogastropoda - Siphonaliidae
 Neogastropoda - Clavatulidae
Turricula emerita1 Hickman 1976 snail
 Neogastropoda - Turridae
Procerapex bentsonae1 Durham 1944 turrid
Parasyrinx delicata1 Hickman 1976 turrid
Pleuroliria oregonensis1 Hickman 1976 turrid
 Neogastropoda - Costellariidae
Conomitra vernoniana Hickman 1980 ribbed mitre
 Neogastropoda - Cancellariidae
"Admete" umbilicata n. sp. Hickman 1980 admete
Bonellitia (Admetula) tumida Hickman 1980 snail
 Sorbeoconcha - Bursidae
Olequahia schencki Durham 1944 frog shell
 Sorbeoconcha - Naticidae
Polinices (Euspira) nuciformis Gabb 1864 moon snail
Polinices (? Euspira) clementensis Hanna 1927 moon snail
Neverita (Neverita) washingtonensis Weaver 1916 moon snail
Natica (Natica) weaveri Tegland 1933 moon snail
 Opisthobranchia - Cylichnidae
Bivalvia
 Thraciida - Thraciidae
Thracia keaseyensis2 Hickman 2014 clam
 Cardiida - Veneridae
Lamelliconcha clarki3 Dickerson 1917 venus clam
 Cardiida - Cardiidae
Anechinocardium weaveri3 Anderson and Martin 1914 cockle
Crinoidea
 Isocrinida - Isocrinidae
"Isocrinus oregonensis" = Raymondicrinus oregonensis4
"Isocrinus oregonensis" = Raymondicrinus oregonensis4 Moore and Vokes 1953 Sea lily