Abstract
THE material used in this study is from exposures along the east shore of Newport Bay, California (Fig. 1). This section contains good assemblages of benthonic foramini-fera of Kleinpell's upper Luisian and lower Mohnian stages1. The Luisian and Mohnian stages are represented by the upper middle and the lower upper part of the Miocene Monterey Shale. These stages are traditionally denned by their characteristic benthonic foraminiferal species. In recent years emphasis has been placed on worldwide planktonic foraminiferal zonation and correlation. Calcareous nannoplankton have also proved to have great biostratigraphic value because of their extreme abundance in many samples, wide geographic distribution and the very short geological range of some species.
Published Version
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