Group composition of organic matter in recent ocean sediments with high Corg content has been studied in detail. It has been shown that organic matter in sediments with Corg content greater than 4% is present in the very earliest stages of transformation. Group composition of amino acids is practically similar to that of their main producer, namely phytoplankton. Organic matter of sediments with Corg content below 4% is, from this standpoint, more transformed and is close to organic matter in usual type sediments with similar Corg content.

Supplement to: Korzhikova, L I; Smirnov, B A; Bordovsky, Oleg K (1979): Characteristics of the chemical composition of organic matter in ocean sediments in regions of its large-scale accumulation. Oceanology, 19(3), 276-280