Igarashi Pyroclastic Flow Deposit

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Igarashi Pyroclastic Flow Deposit

Volcanic rocks
early Pleistocene
Intruded by: Quartz hypersthene hornblende andesite - dacite dike

Lithofacies: Pyroclastic flow deposit (3 flow units)

3rd stage products
[ Upper ]
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Iijichuo Lava Dome
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Tachigarayama Lava Dome
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Ohara Pyroclastic Flow Deposit
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Ohara Lava
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Seki Lava
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Igarashi Pyroclastic Flow Deposit
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Igarashisekishoku Lava
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Igarashi Lava Dome
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Yuzawa Lava Dome
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Horikiri Lava
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Upper Yuzawa Lava
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[ Lower ]

Iiji volcano
[ Upper ]
+__+__+__+__+_
3rd stage products
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2nd stage products
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1st stage products
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[ Lower ]

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

Distribution: Igarashi, Yuzawa city, Minamiuonuma county, Niigata pref.

Chihara et al. (1981) Geology of the Echigo-Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 108p. (in Japanese with English abstract 8p.)