Submarine Topography and Bottom Sediments off Kumano-Nada and Enshu-Nada

Amino Acids in Sediment from the Japan Trench

“…the amount of calcium carbonate in sediments abruptly decrease in water deeper than 4, 000-5, 000 m. Although the amount of organic nitrogen is not different from that in ordinary blue mud on the continental slope, the ratio of organic carbon to organic nitrogen is fairly large. This value corresponds to blue mud on the Enshu-Nada (HOSHINO and ICHIHARA 1960). A small quantity of pollen of inland plants was found in the sample.…”