A6stmctAn absolute chronology of deep-sea sediments on thc basis of the accumulation of TiO, presupposes the rate of accumulation of clay to be tolerably constant with regard to timc. It is hcrc asserted that this condition is not fulfilled, becausc I) the supply of fine terrigeneous matter to offshore waters will be appreciably affected by climatic changes, 2) the total amount of fine terrigeneous matter carried in suspension by sea water is deposited in about 300 years, which is a small fraction of a climatic cycle, and, consequently, 3) the amount of tine terrigeneous matter present in the sea is insufficient to act as a buffer against the variations of the supply, on account of which these variations will be reflected by almost equally great variations of the rate of accumulation.
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