Abstract
The diatoms, dinoflagellates, silicoflagellates and tintinnids in phytoplankton samples from three cruises to the Gulf of California have been analyzed and from the data four distinct water masses have been shown to exist. Comparison with previous accounts suggests that this is a relatively stable feature of the region. Very large standing crops occur in the central Gulf region. Examination of surface samples from the sediments has revealed a clear correlation between the sedimentary assemblages of diatoms and the phytoplankton zones above. Only the strongly silicified diatom species are, however, preserved in the sediments and thus only a fraction of the phytoplankton is represented. Lateral displacement of the phytoplankton during sedimentation does not appear to be great.
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