Seven samples of siliceous and calcareous oozes from about 110 to 410 feet below the sea floor in the Experimental Mohole core consist of radiolarian tests, minerals of volcanic origin, very finely divided calcite and clay. The clay consists of interlayered mixtures of montmorillonites, chlorites, mica, and vermiculite. Exchange capacities for the clay fractions range from 24 to 36 milliequivalents per 100 grams, and for the whole samples from 6 to 20 milliequivalents.

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