Occurrence horizons of diatom fossils and recognition of marine sediments in the Shobu Core (GS-SB-1), Saitama Prefecture, central Kanto plain, Japan

Abstract

    Diatom fossils were examined in order to recognize marine and freshwater sediments in the Shobu core (GS-SB-1), central Kanto plain, Japan. Diatom fossils occur in 174 samples of 306 investigated samples. Fresh water diatoms and brackish and/or marine diatoms occur in 159 samples and 44 samples, respectively. As a result, nine marine intervals were recognized at following depth of the GS-SB-1 core; 27.625 - 32.875 m, 75.45 m, 114.375 - 118.375 m, 157.32 - 164.875 m, 216.6 - 219.3 m, 255.1 - 262.0 m, 273.72 - 276.3 m, 280.6 - 282.6 m and 314.4 - 319.25 m.