Also known as USGS 15525
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
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 40190: authorized by Austin Hendy, entered by Austin Hendy on 19.06.2004, edited by Mark Uhen
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Turritella keaseyensis Hickman 1980 turret shell | |
Olequahia schencki Durham 1944 frog shell | |
Echinophoria dalli Dickerson 1917 snail | |
Bonellitia (Admetula) tumida Hickman 1980 snail | |
Scaphander impunctatus Hickman 1980 snail | |
Bivalvia | |
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