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Nannoplankton and planktonic foraminiferal data are presented in order to demonstrate that the Refugian Stage of the Pacific Coast Tertiary may be equated with the Discoaster barbadiensis Zone, Isthmolithus recurvus Subzone, and with the P.16 and P.17 foraminiferal zones. Data derived from sediments assigned to the adjacent Narizian and Zemorrian Stages are also considered in order to delimit the extent of the Refugian Stage with respect to plankton zonations. The Refugian Stage is considered to be correlative to all or parts of the Jacksonian Stage of the Atlantic and Gulf Coastal Province, the Priabonian Stage of Europe, and the Kaiatan and Runangan Stages of New Zealand.

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