The second discovery of a Late Cretaceous ammonite from the Shimanto Belt in Mugi, Tokushima Prefecture, eastern Shikoku, Japan

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  • 四国東部・徳島県牟岐町の四万十帯より新たに発見された後期白亜紀アンモナイト
  • シコク トウブ トクシマケン ムギチョウ ノ シマントタイ ヨリ アラタ ニ ハッケン サレタ コウキ ハクアキ アンモナイト

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A Late Cretaceous ammonite was discovered from the lower section of the Mugi Melange of the Shimanto Belt in the Kusunoura area, Mugi, Tokushima Prefecture, Japan. The ammonite is identified with Gaudryceras cf. tombetsense reported from the K2 unit (Maastrichian) of the Krasnoyarka Formation, Makarov area, southern Sakhalin, Russia. The lower section of the Mugi Melange is assigned to the early Paleogene, based on a recently obtained U-Pb zircon age. It is reasonable to assume that the ammonite from the Kusunoura area was trapped as an exotic block within the lower section of the Mugi Melange.

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