Twin Rivers, UCMP A3690 (Oligocene of the United States)
Where: Clallam County, Washington (48.2° N, 123.9° W: paleocoordinates 47.8° N, 115.0° W)
• coordinate based on nearby landmark
When: Twin Rivers Formation, Late/Upper Oligocene (28.4 - 23.0 Ma)
Environment/lithology: marine; lithified shale
Size class: macrofossils
Primary reference: J. W. Durham. 1944. Megafaunal zones of the Oligocene of northwestern Washington. University of California Publications in Geological Sciences 27:101 -212 [P. Holroyd/E. Orzechowski]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 208160: authorized by Mark Uhen, entered by Mark Uhen on 22.03.2020
Creative Commons license: CC BY (attribution)
Taxonomic list
Show authors, comments, and common names
| Gastropoda | |
|
Surculites "sp. B" Conrad 1865 turrid | |
| Cephalopoda | |
|
Aturia angustata Conrad 1849 | |
| Bivalvia | |
"Pecten clallamensis" = Propeamussium clallamensis
"Pecten clallamensis" = Propeamussium clallamensis Arnold 1906 mud scallop | |
"Venericardia hannai" = Cyclocardia hannai
"Venericardia hannai" = Cyclocardia hannai Tegland 1933 clam | |