Also known as USGS 25028
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: Lower Member (Keasey Formation), Priabonian (38.0 - 33.9 Ma)
• Lower member consists of 0-150 m of dark gray, highly micaceous, laminated siltstone and interbedded mudsone. Glaucontitc layers are not uncommon. 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; micaceous, gray siltstone and 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 39952: authorized by Austin Hendy, entered by Austin Hendy on 12.06.2004, edited by Mark Uhen
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Bathybembix columbiana Dall 1909 snail | |
Epitonium (Boreoscala) keaseyense Durham 1937 wentletrap | |
Trophonopsis platacantha Hickman 1980 true whelk | |
Conus weltoni Hickman 1980 cone shell | |
Exilia bentsonae Hickman 1980 snail | |
Echinophoria dalli Dickerson 1917 snail | |
Bivalvia | |
Moerella quasimacoma Hickman 2015 tellin clam | |
Cyclocardia moniligena n. sp.
Cyclocardia moniligena n. sp. Hickman 2015 clam |