Knappton Mill (Oligocene of the United States)

Also known as CAS 611

Where: Pacific County, Washington (46.3° N, 123.8° W: paleocoordinates 46.0° N, 114.9° W)

When: Late/Upper Oligocene (28.4 - 23.0 Ma)

• Upper Oligocene series, Blakeley horizon (Acila gettysburgensis zone of C.E. Weaver); associated with Limnopsis, species, and Phacoides columbianum Clark and Arnold.

Environment/lithology: marine; sandstone and shale

• "Sandstones in shales in bluffs"

Size class: macrofossils

Collection methods: One specimen, Stanford University (N. Pac.275)

Primary reference: M. J. Rathbun. 1926. The Fossil Stalk-Eyed Crustacea of the Pacific Slope of North America. United States National Museum Bulletin 138:1-155 [C. Schweitzer/S. Yost/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 139526: authorized by Carrie Schweitzer, entered by Samantha Yost on 13.02.2013, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

 Decapoda - Xanthidae
Pilodius vulgaris Glaessner 1928 stone crab
 Neogastropoda - Turridae
Clivuloturris levis Hickman 1976 turrid
Ptychosyrinx thurstonensis Weaver 1916 turrid