title: Pleistocene age determinations from california and Oregon.
abstract: Mollusks have been collected from Pleistocene marine deposits at Tomales Bay, California, and Cape Blanco, Oregon. Dating by the carbon-14 and thorium-230-uranium-234 methods suggests that the shells are at least 33,000 years old. The more probable age of the Tomales Bay locality is >/= 50,000 years.
authors.forename: H G
authors.initials: HG
authors.lastname: Richards
authors.forename: D L
authors.initials: DL
authors.lastname: Thurber