Nittazawa Lavas

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Nittazawa Lavas Ota and Katada, 1955

Volcanic rocks
Middle Pleistocene (0.49 Ma)

Lithofacies: Orthopyroxene-clinopyroxene andesite

Source: East of Mount Urakura
Upper limit: Unconformity (Kamitokusa Lavas, Oshi Pyroclastic Flow Deposit)
Lower limit: Unconformity (Kadokai Formation)

Urakurayama volcanic edifice
[ Upper ]
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Ikenotaira Lava
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Urakura Lavas
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Kamitokusa Lavas
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Yonagokimyo Lavas
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Kaminokai Lavas
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Akagawa Lavas
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Nittazawa Lavas
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[ Lower ]

Azumaya volcano
[ Upper ]
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Urakurayama volcanic edifice
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Nekodake volcanic edifice
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Initial volcanic edifice
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[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Manza river - Mount Kamitokusa - Nittazawa, Tsumagoi city, Agatsuma county, Gunma pref.
Depostis (Halloysite): Joshin mine

Nishiki et al. (2014) Jour. Geol. Soc. Japan, vol.120, no.3, pp.89-103 DOI
Ota (1957) Kusatsu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 8p.)
Ota and Katada (1955) Suzaka, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 6p.)