岡山県蒜山原の第四系(2)

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タイトル別名
  • Quaternary System of the Hiruzenbara, Okayama Prefecture
  • オカヤマケン ヒルゼン ゲン ノ ダイ4ケイ 2

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説明

Hiruzenbara is situated at the northern part of Okayama Prefecture and forms the intra-mountaneous basin at a height of about 400 m from the sea level. There develop the river terraces which are underlain by the volcanic products and diatomaceous earthes of non-marine origin. The latter has been called the Hiruzenbara Formation. The writers have carried out the collaborated works since 1971, to clear the geologic age and histories of that formation. Thus, the followings were concluded. (1) The Hiruzenbara Formation is not the Pliocene deposit foremerly considered, but of the middle Pleistocene in age; it may be referred to the M/R interglacial and Riss glacial stages. (2) Diamatoceous earthes of the Hiruzenbara Formation are divided into three diatom assemblages. It shows that the sedimentary environment changed from warm to cool. (3) The Palaeo-Hiruzenbara Lake was filled up and died out in the Riss glacial stage, and subsequently the Hiruzenbara Formation was covered by the volcanic products of Mt. Daisen. Thereafter, four terraces were formed. (4) The Hanazona peat which is intercalated into the lower terrace deposits, shows the age of 21710 Y.B.P. (Gak.-4033). It corresponds to the Maximum Wurm.

収録刊行物

  • 地球科学

    地球科学 29 (5), 227-237, 1975

    地学団体研究会

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