Where: Lincoln County, Oregon (44.4° N, 124.1° W: paleocoordinates 44.1° N, 113.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Alsea Formation, Rupelian (33.9 - 28.1 Ma)

• Mapped as the Alsea Formation. Formation contains mollusks of the "Lincoln" stage throughout most of the unit ("Blakeley" stage mollusks in the uppermost 340 m) and is correlated with the earliest Oligocene C12n-C13r chrons (Prothero et al., 2012). Wells et al. (2014) correlated the unit with the Keasey and Lincoln Creek Formations and reported a U-Pb age of 34.6 Ma from the unit, suggesting that the basal part is latest Eocene.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; tuffaceous sandstone

Size class: macrofossils

Collected by H.G. Schenck in 1926; reposited in the USNM

Primary reference: M. J. Rathbun. 1932. New species of fossil Raninidae from Oregon. Journal of the Washington Academy of Sciences 22(9):239-242 [C. Schweitzer/S. Yost/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 135996: authorized by Carrie Schweitzer, entered by Samantha Yost on 14.11.2012

Creative Commons license: CC BY (attribution)