Also known as USGS 15601
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: 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
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)
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 40202: authorized by Austin Hendy, entered by Austin Hendy on 19.06.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Bathybembix sp. n. sp., Bathybembix nitor
Bathybembix sp. n. sp. Crosse 1892 snail
Bathybembix nitor Hickman 1980 snail | |
Turritella keaseyensis Hickman 1980 turret shell | |
Trophonopsis platacantha Hickman 1980 true whelk | |
Procerapex bentsonae Durham 1944 turrid
Ptychosyrinx facula Hickman 1976 turrid | |
Conomitra vernoniana Hickman 1980 ribbed mitre | |
Echinophoria dalli Dickerson 1917 snail | |
Polinices (Euspira) nuciformis Gabb 1864 moon snail
Polinices (? Euspira) clementensis Hanna 1927 moon snail
Neverita (Neverita) sp. Risso 1826 moon snail | |
Scaphander impunctatus Hickman 1980 snail |