TrekGEO > Mineral Trail > Kanto region > Tochigi pref. > Kanuma

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Shimo-Ishikawa, Kanuma city, Tochigi pref., Japan


Sediments subjected to diagenesis

Weathered pumice of Late Pleistocene Ag-KP. Ag-KP distributes widely at the eastern side of Mount Akagi to the Pacific ocean, and its unique oragne color is a good key bed.


Outcrop of a pumice bed of Ag-KP. The pumice bed is composed of orange pumices approximately 5 mm in diameter. Note that wet pumices are orange but dry ones turn pale brown. This altered pumice, Kanuma-tsuchi, has been mined and sold as cultivation soil for Bonsai.

Reported Minerals

Mineral Assemblages

  • Imogolite - Allophane
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