The modern San Pedro and Santa Monica basins off southern California are about 1,000 deep and contain mostly olive clay silts in the basin floors and fine gray sand and silt in the subsea fans. Piston core samples were analyzed to determine the dominant foraminiferal l variation between these two types of environment. A mean of about 20 species characterizes the basin floor sediments and about 15 of the subsea fan deposits. Foraminiferal numbers average between 141 and 362 in the clays and silts, and only 23 in the Redondo fan sands.-- V.M.J

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