珪藻遺骸からみた越後平野,月潟地域における上部完新銃の環境変遷とその地史学的意義

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  • ケイソウ イガイ カラ ミタ エチゴ ヘイヤ ツキ ガタ チイキ ニ オケル ジョウブ カンシントウ ノ カンキョウ ヘンセン ト ソノ チ シガクテキ イギ
  • Upper Holocene environmental changes and their geohistorical significance inferred from diatom assemblages from the Tbukigata area of the Echigo Plain, central Japan

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Abstract

Analysis of samples from the uppermost Shirone and Kurotori formations of the Tsukigata area, Echigo Plain has shown them to be rich in diatom floras. The age of the samples was estimated to be about 6300y.B.P. or younger (Upper Holocene). Over 130 diatom taxa were identified, and were divided into nine provisional diatom divisions. Most of the assemblages analyzed were dominated by freshwater species, and their environments were inferred to be marshes, moors and ponds. Two brackish water horizons were also recognized, and their environments were inferred to be estuaries or tidal flats. These last were probably deposited during relatively minor transgressions of the Echigo Plain.

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