愛媛県八幡浜・川之石低地の上部更新統および完新統の層序と堆積環境

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タイトル別名
  • エヒメケン ヤワタハマ カワノイシ テイチ ノ ジョウブ コウシントウ オヨビ カンシントウ ノ ソウジョ ト タイセキ カンキョウ
  • Stratigraphy of the Late Pleistocene and the Holocene and Sedimental Environment in the Yawatahama and the Kawanoishi Lowlands,Ehime Prefecture,southewest Japan

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In the Yawatahama and the Kawanoishi Lowlands,locate in the western part of the Shikoku Island,the late Pleistocene and the Holocene sediments are divided into the Uwa Kai and the Yawatahama-ko Formations.The volcanic ash found in the middle part of the Uwa Kai Formation and Honai Volcanic Ash in the middle part of the Yawatahama-ko Formation can be correlated with Kuju-daiichi Pumice and Kikai-Akahoya Volcanic Ash respectively.The middle part of the Uwa Kai Formation deposited since 80-70ka and before 51ka of the late Pleistocene as marine sediment. The upper part of the Formation was deposited since 51ka the late Pleistocene as non-marine sediment. The Yawatahama-ko Formation was formed during the Holocene. At first,the formation began to deposit in drowned valley and next,the inner-bay prodelta and delta-front deposits followed during the early to middle Holocene. Finally,interdistributary bar sediments in the Kawanoishi Lowland and inner-bay sediments in the Yawatahama Lowland have been deposited since the middle Holocene.

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