Oiwake Pyroclastic Flow Deposit

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Oiwake Pyroclastic Flow Deposit

Invalid synonum: Ozasa Nuees Ardentes

Tephra
Holocene

Lithofacies: Pyroclastic flow deposit
Lithofacies: Andesite
Lithofacies (Minor): Wood fragments

Source: Asamayama volcano
Thickness: 100 - 150 m
Lower limit: Unconformity (Imai Gravels)

Asamayama volcano
[ Upper ]
~~~~~~~~~~~~~~
Onioshidashi Lava
~~~~~~~~~~~~~~
Kanbara Mudflow Deposit
~~~~~~~~~~~~~~
Oiwake Pyroclastic Flow Deposit
~~~~~~~~~~~~~~
Tsumagoi Pyroclastic Flow Deposit
~~~~~~~~~~~~~~
Okuwa Debris Avalanche Deposit
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Ozasa - Omae, Tsumagoi city, Agatsuma county, Gunma pref.; Shiono - Maseguchi, Miyota city, Kitasaku county, Nagano pref.; Ishitoge pass, Komoro city, Nagnao pref.

Kawachi and Aramaki (1979) Geology of the Komoro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 2p.)
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.)