Fossils in Washington by Vaughn E. Livingston

Published in 1959, this booklet contains information about fossils in Washington state. Scientistic and location information may be outdated.

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Ypresian (Wikipedia) In the geologic timescale the Ypresian is the oldest age or lowest stratigraphic stage of the Eocene. It spans the time between 56 and 47.8 Ma, is preceded by the Thanetian Age (part of the Paleocene) and is followed by the Eocene Lutetian Age. The Ypresian is consistent with the lower Eocene.