The Vaqueros formation of the Coast Ranges of California has not been adequately defined as a stratigraphic unit and its early Miocene age is an assumption. Considering that Lyell (1833) specified a type locality for the Miocene, and believing that the Aquitanian stage of Europe should be taken as upper Oligocene, the writer expresses the opinion that the Turritella inezana zone, in whole or in part, may prove to be of Oligocene age.

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