UCMP A1810, Willapa river, east of Holcomb (Oligocene of the United States)

Where: Pacific County, Washington (46.6° N, 123.6° W: paleocoordinates 46.2° N, 112.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Lincoln Creek Formation, Rupelian (33.9 - 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 early Oligocene (or perhaps late Eocene) age.

• group of beds-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 UCMP, USNM

Collection methods: quarrying

• Collections are reposited in UC Berkeley Museum of Paleontology (UCMP)

Primary reference: J. W. Durham. 1937. Gastropods of the Family Epitoniidae from Mesozoic and Cenozoic Rocks of the West Coast of North America, including One New Species by F. E. Turner and One by R. A. Bramkamp. Journal of Paleontology 11(6):479-512 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39965: authorized by Austin Hendy, entered by Austin Hendy on 12.06.2004, edited by Jonathan Marcot and Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Lucinida - Thyasiridae
Thyasiridae indet.2 Dall 1901 clam
 Protobranchia - Solemyidae
Solemyidae indet.2 Adams and Adams 1857 Awning Clam
Gastropoda
 Ptenoglossa - Epitoniidae
 Neogastropoda - Fasciolariidae
Fusinus dilleri3 Hickman 1980 snail
 Neogastropoda - Cancellariidae
 Neogastropoda - Conidae
Conus weltoni3 Hickman 1980 cone shell
 Pyramidelloidea - Pyramidellidae
Cyclostremella sp.3 Tate 1898 snail
 Seguenzioidea - Calliotropidae
Bathybembix columbiana3 Dall 1909 snail
 Trochoidea - Trochidae
Margarites (Pupillaria) sp.3 Dall 1909 top snail
Cephalopoda
 Nautilida - Aturiidae
Aturia cf. grandior4 Schenck 1931 nautiloid
Anthozoa
 Scleractinia - Caryophylliidae
Stephanocyathus holcombensis n. sp.1 Durham 1942 stony coral
 Scleractinia - Flabellidae
Flabellum hertleini n. sp.1 Durham 1942 stony coral