These fossils were found at Beverly Beach, north of Newport, Oregon. I believe they are from the Astoria Formation, a richly fossiliferous Miocene marine formation. My main reference for fossil identification was a booklet Fossil Mollusks of Coastal Oregon by Ellen J. Moore (Oregon State University Press, Corvallis, OR). A more recent publication with roughly the same information, Fossil Shells from Western Oregon by Ellen J. Moore is available from Chintimini Press.
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