常総台地第四系の化石珪藻群集

概要

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The authors analyzed diatom assemblage of the core sample taken from the Narita formations. The core sample was collected by percussion boring at 2 stations on the Joso plain of Akashi area, Tsukuba-machi, and Kamigo area, Toyosatomachi, Tsukuba-gun, Ibaragi Prefecture. From the result of the study, We have attemped to discuss the sedimentary environment of the Narita formations. The assemblage is composed of 84 species of 38 generas of diatoms at Akashi and 91 species of 31 generas at Kamigo. These species are equivalent to one living in recent marine, brackish and fresh water. The specific names and their frequencies are shown in Table 3. The assemblage of Akashi suggests that there was an inlet which was strongly influenced by the saline water, but the one of Kamigo suggest that there was an inlet which was strongly influenced bv fresh water.
地学団体研究会の論文
1967-11-25