Pacific Coast paleontological correlations in the Oligocene have been hindered by misinterpretations of faunas, because of biofacies differences and limited stratigraphic evidence from too few samples.

The "lower Zemorrian" is redefined, and the boundary between the Refugian and Narizian microfaunal stages is re-examined. The type areas of the Saucesian, Zemorrian, and Refugian stages are compared with the historically complete sections in the Santa Cruz Mountains of California and in the coastal ranges of Oregon, Washington, and southern Alaska.

Figures show bases for correlation in the phylogeny of the Uvigerininae. A chart presents correlations of microfaunas compared with the record of North American vertebrate provincial ages, geochemical dating, and the Gulf of Mexico and Mediterranean regions.

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