Hotama Tuff

[ Top ] [ Japanese ]

Hotama Tuff Akahane, 1980

Tephra
late Miocene

Lithofacies: Rhyolitic tuff, Lapilli tuff, Tuff breccia, Lava, Pumice tuff

Thickness: 250 m or thicker

Lower Susobana Tuff Member
[ Upper ]
--------------
Hotama Tuff
--------------
Nashikubo Sandstone and Conglomerate
--------------
Hanakami Tuff Breccia
--------------
Shinbashi Pumice Tuff
--------------
Hotokezawa Tuff
--------------
Takizawa Dacite Tuff
--------------
Nakaoyama Rhyolite Lava
--------------
Saizawa Pumice Tuff
--------------
Komatsubara Tuff
--------------
Koichi Dacite Tuff
--------------
[ Lower ]

Togakushi (East), Nagano pref.
[ Upper ]
--------------
Ronji Formation
~~~~~~~~~~~~~~
Susobana Formation
--------------
Asakawa Formation
--------------
Nishikyo Formation
--------------
[ Lower ]

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

Distribution: Nagano pref.

Kato and Akahane (1986) Geology of the Nagano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 120p. (in Japanese with English abstract 5p.)