Wachiba Member

Wachiba Member Kato et al., 1989

Invalid synonym: Toge Sandy Mudstone Member, Shingyo Tuff and Sandstone Member

Type locality: Wachiba - Ichiuda, Omachi city, Nagano prefecture
Coherent formation
Pliocene
Intruded by: Taroyama Andesite

Lithofacies: Interbedded biotite rhyolite pyroclastic flow deposit and Sandy conglomerate
Lithofacies (Minor): Sandy mudstone
Sedimentary structures (Pyroclstic flow deposit): Graded bedding

Thickness: 2,000 m or thicker
Upper limit: Unconformity (Taroyama Andesite)
Lower limit: Conformity (Horinouchi Member)

Miasa Formation
[ Upper ]
--------------
Wachiba Member
--------------
Horinouchi Member
--------------
[ Lower ]

Omachi, Nagano pref.
[ Upper ]
~~~~~~~~~~~~~~
Omine Formation
~~~~~~~~~~~~~~
Miasa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Wachiba - Ichiuda, Omachi city, Nagano pref.

Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)