Abstract
The lagoon sediments of Hachiro-gata, near Akita City, consist of a copropelic facies accumulation of peat, peaty silt, and dark grey or green colored clay, in which carbonaceous matter, plant fragments, and shell remains etc. are widely distributed. Extractable organic matter, hydrocarbon content, and some other organic compounds of the 45 specimens collected from these sediments were determined. Hydrocarbon fractions were separated from extractable organic matter by liquid chromatography on alumina. It is ascertained that the contents of hydrocarbons increases and the amounts of extractable organic matter decreases with increasing depth of burial below the floor of the lagoon. In this paper, their stratigraphical distribution and some alteration of organic matters in sediments are described.
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