Osawa Pyroclastic Flow Deposit

Tephra
Pleistocene - Holocene

Sedimentary facies: Pyroclastic flow deposit
Lithofacies: Hornblende hypersthene augite dacite

Upper limit: Unconformity (Yudonosawa Andesite)

Nantai volcano
[ Upper ]
~~~~~~~~~~~~~~
Yudonosawa Andesite
~~~~~~~~~~~~~~
Osawa Pyroclastic Flow Deposit
~~~~~~~~~~~~~~
Onagi Welded Tuff
~~~~~~~~~~~~~~
Kegon Lava
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Ryuzu fall - Yukawa river - Osawa creek, Nikko city, Tochigi pref.

Kawata (1955) Nantaizan, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 43p. (in Japanese with English abstract 7p.)