Twin River Quarry (Oligocene of the United States)

Also known as LACM 5930

Where: Clallam County, Washington (48.2° N, 124.0° W: paleocoordinates 47.8° N, 115.0° W)

• coordinate estimated from map

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

• latest Oligocene

•early Chattian (28.1–26.5 Ma). Samples of the Pysht Formation from either side of Twin Rivers correlate with Chrons C9r–C8r (28.1–26.5 Ma) [106]. (Marx & Fordyce, 2015)

• formation-level stratigraphic resolution

Environment/lithology: basinal (siliceous); concretionary mudstone

• whale fall

Size class: macrofossils

Preservation: original phosphate

Reposited in the LACM

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 45784: authorized by Mark Uhen, entered by Mark Uhen on 01.12.2004, edited by Carlos Peredo

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Sorbeoconcha - Cassidae
Liracassis apta2 Tegland 1931 snail
Aves
 Suliformes - Plotopteridae
Klallamornis abyssa n. gen. n. sp.1
Klallamornis abyssa n. gen. n. sp.1 Mayr and Goedert 2016 bird
precise locality information not listed for this occurrence
Mammalia
 Cetacea - Aetiocetidae
"Chonecetus goedertorum n. sp." = Fucaia goedertorum
"Chonecetus goedertorum n. sp." = Fucaia goedertorum Barnes et al. 1995 whale
 Cetacea -
Sitsqwayk cornishorum n. sp.3 Peredo and Uhen 2016 whale