six western Washington geographic quadrangles.

Age

The total deposition time has been estimated to be as short as approximately 7.7 million years, from around based on isotopic data reported in 1993 or as long as based on the paleofloristic data of Wolfe (1968, 1977)

Western North American floral stages

The Western North American floras of the Eocene were divided into four floral "stages" by Jack Wolfe (1968)

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