A study was made of the Foraminifera, diatoms, and Radiolaria in bottom samples from the Gulf of California. Seventeen separate foraminiferal faunas are recognized, spanning the range from paralic facies to a depth of more than 3,000 m. Planktonic and benthonic Foraminifera are more abundant than diatoms and Radiolaria in sediments of the continental shelf and in the upper bathyal zone; Radiolaria and diatoms are most abundant in sediments of the basin bottoms; Radiolaria are relatively most abundant in the deepest basins at the S. end of the Gulf. Sill depths appear to control the dominant distribution patterns of the basin assemblages.

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