. The Earth beneath the sea : History . (a) (b) (c) (d) Fig. 32. Distribution of nitrogen between ammonia and nitrate in interstitial solution of core Capricorn 38 BP (South Pacific, 14° 16'S, 119° ll'W; 3400 m). (From Arrhenius and Rotschi, 1953.) organic matter is oxidized soon after deposition. The oxidation probably is accomplished mainly by bacteria and mud-eating animals concentrated in the surface layer of the sediment (cf. Section 5, and ZoBell, 1946, p. 91). In pelagic sequences far from any terrestrial source of organic matter, the concentration

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