Itokaya Pyroclastic Flow Deposit

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Itokaya Pyroclastic Flow Deposit

Tephra
Pleistocene

Lithofacies: Hornblende dacite pyroclastic flow deposit, Mudflow deposit
Lithofacies (Minor): Charcoal

Upper limit: Unconformity (Nagakura Formation, Yokoyakyo Lavas, Itokaya Lava)
Lower limit: Unconformity (Honzawa Lava and Scoria)

Younger period (Mount Iodake)
[ Upper ]
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Mikaburiyama Welded Tuff
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Minenomatsume Lava
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Minotonakayama Lava
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Amigasayama Lava
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Itokaya Pyroclastic Flow Deposit
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Amidadake Lava
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[ Lower ]

Yatsugatake volcano
[ Upper ]
+__+__+__+__+_
Younger period
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Older period
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[ Lower ]

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

Distribution: Shibukawa river - Naruiwagawa river - Shibunoyu hot spring - Shiranagi creek, Chino city, Nagano pref.

Kawachi (1977) Geology of the Yatsugatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 92p. (in Japanese with English abstract 4p.)
Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)