Ona Beach (Oligocene of the United States)

Also known as UCMP V79013, LACM 4290, UCMP V79036

Where: Lincoln County, Oregon (44.5° N, 124.1° W: paleocoordinates 44.2° N, 115.1° W)

• coordinate based on unpublished field data

When: Yaquina Formation, Chattian (28.1 - 23.0 Ma)

• near the top of the Yaquina Formation, very close to the contact with the overlying Nye Formation

•UCMP 122900 was found on the same beach as the holotype of A. cotylalveus, and may either have originated from the same stratigraphic horizon (about 28 Ma), or from a slightly younger layer [22, 24]. Although originally thought to date from the latest Oligocene, the uppermost part of the Yaquina formation has now been re-dated to the earliest Chattian (28.1–28.0 Ma [25]; see discussion of A. cotylalveus). (Marx & Fordyce, 2015)

• formation-level stratigraphic resolution

Environment/lithology: deltaic; lithology not reported

• shallow delta

Size class: macrofossils

Preservation: original phosphate

Reposited in the UCMP

Collection methods: surface (in situ),

Primary reference: L. G. Barnes, M. Kimura, H. Furusawa and H. Sawamura. 1995. Classification and distribution of Oligocene Aetiocetidae (Mammalia; Cetacea; Mysticeti) from western North America and Japan. The Island Arc 3(4):392-431 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 45788: authorized by Mark Uhen, entered by Mark Uhen on 01.12.2004, edited by Patricia Holroyd

Creative Commons license: CC BY (attribution)

Taxonomic list

 Lamniformes - Megachasmidae
Megachasma applegatei3 Shimada et al. 2014 mackerel shark
 Perissodactyla - Desmostylidae
Cornwallius sookensis1 Cornwall 1922 desmostylian
 Carnivora -
Enaliarctos cf. tedfordi2 Berta 1991 pinniped
 Mysticeti - Aetiocetidae
Aetiocetus weltoni n. sp. Barnes et al. 1995 whale