Morphological Features of Tafoni on Paleogene Sandstone Cliff in Amakusa Kami-Island, Kumamoto Prefecture, Kyushu, Japan

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  • 熊本県, 天草上島の古第三系砂岩に分布するタフォニの形状
  • クマモトケン アマクサ カミシマ ノ コ ダイ3ケイ サガン ニ ブンプ スル タフォニ ノ ケイジョウ

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 Morpholological features of tafoni have been studied, which are well developed on sandstone cliff in the Amakusa Kami-Island, Kumamoto, Kyushu, Japan. Numerous tafoni were observed on rock surface of sandstone not only in coastal zone, but also inland mountainous zone. Rock meal fallen from concave roofs of tafoni indicates that tafoni have grown continuously. Lowest value in rock hardness on the concave roof surfaces support that tafoni has been formed with high decreasing rate of rock strength. This means that the growth of tafoni may also be closely related to salt weathering.

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