Tsubono Pyroclastic Rocks

[ Top ] [ Japanese ]

Tsubono Pyroclastic Rocks Igarashi et al., 1984

Type locality: Tsubono, Sakae city, Shimominochi county, Nagano prefecture
Volcanic rocks
Pleistocene

Lithofacies: Hypersthene augite andesite tuff breccia

Thickness: 50 m or thicker
Upper limit: Unconformity (Oirizawa Lava)
Lower limit: Unconformity (Shikumigawa Formation)

Kenashi volcano
[ Upper ]
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Kenashiyama volcano
~~~~~~~~~~~~~~
Western basal volcanic rocks / Mizuo-Oiriyama volcano
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[ Lower ]

Kenashi volcano
[ Upper ]
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Hakkenzan Lava
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Ojiroyama Lava
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Kawakurumizawa Lava
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Oirizawa Lava
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Tsubono Pyroclastic Rocks
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[ Lower ]

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

Distribution: Tsubono - Nagase, Sakae city, Shimominochi county, Nagano pref.

Shimazu and Tateishi (1993) Geology of the Naebasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)