SU Loc. N.P.253, Willapa River N of Holcomb (Eocene to of the United States)

Where: Pacific County, Washington (46.6° N, 123.6° W: paleocoordinates 46.5° N, 112.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Lincoln Creek Formation, Priabonian to Priabonian (38.0 - 28.1 Ma)

• "Keasey equivalent" beds, likely the Lincoln Creek Formation. Given the location, it is probably from the lower part of the stratigraphy and of late Eocene or perhaps early Oligocene age.

• bed-level stratigraphic resolution

Environment/lithology: deep-water; micaceous, gray siltstone and mudstone

• The molluscan fossils from this locality were regarded as being a “deep-water” assemblage by Hickman (1984), but estimates of water depth vary from approximately 20 to 100 m (Armentrout 1973), to more than 200 m (Hickman 1980). The section deepens upward and if this locality is near the cold-seep deposits it likely represents bathyal/slope depths.
• Dark gray, highly micaceous, laminated siltstone and interbedded mudstone

Size class: macrofossils

Reposited in the USNM

Collection methods: quarrying,

• Collections are reposited at Stanford University (SU) Northern Pacific collections

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: taxonomic analysis

PaleoDB collection 39961: authorized by Austin Hendy, entered by Austin Hendy on 12.06.2004, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda
Gastropoda
 Seguenzioidea - Eucyclidae
Bathybembix columbiana Dall 1909 snail
Malacostraca
 Decapoda - Carcinidae
Portunites alaskensis Rathbun 1926 crab
 Decapoda - Zanthopsidae
Zanthopsis vulgaris Rathbun 1926 crab
 Decapoda - Lyreididae
"Ranidina willapensis" = Macroacaena willapensis
"Ranidina willapensis" = Macroacaena willapensis Rathbun 1926 crab