Azumaya volcano

Type locality: Mount Azumaya, Nagano prefecture - Gunma prefecture
Volcanic rocks
Caldera volcano
early - Middle Pleistocene (0.8 - 0.45 Ma)

Upper limit: Unconformity
Lower limit: Unconformity (Takai Volcanic Rocks, Fudodo Lava, Yonago Tuff Breccia)

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 ]

Azumaya volcano
[ Upper ]
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Minodo Lava
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[ Lower ]

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

Distribution: Mount Azumaya, Nagano pref. - Gunma pref.
Tephra: Minohara Pumice Bed (Az-Mip, 0.25 Ma), Sugadaira Dai2 Pumice Bed (0.24 Ma)

Takeshita et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.7, pp.233-248, DOI
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.)