Tsuboyama Lava

Tsuboyama Lava Kaneko, 1988

Type locality: Tsuboyama, Nozawaonsen city, Shimotakai county, Nagano prefecture
Volcanic rocks
early Pleistocene (1.58 Ma, K-Ar)

Lithofacies: Augite-bearing andesite lava

Source: Mount Kenashiyama
Thickness: ca. 30 m
Upper limit: Unconformity (Mizuoyamachui Lavas)

Mizuo-Oiriyama volcano
[ Upper ]
~~~~~~~~~~~~~~
Oiriyamasancho Lava
~~~~~~~~~~~~~~
Hikagerindo Lava
~~~~~~~~~~~~~~
Oiriyama Lava
~~~~~~~~~~~~~~
Oiri Lava
~~~~~~~~~~~~~~
Honzawa Lava
~~~~~~~~~~~~~~
Mizuoyamasancho Lava
~~~~~~~~~~~~~~
Mizuoyama Lava
~~~~~~~~~~~~~~
Mushiu Lava
~~~~~~~~~~~~~~
Takakurayama Lava
~~~~~~~~~~~~~~
Takakura Lava
~~~~~~~~~~~~~~
Mizuoyamachui Lavas
~~~~~~~~~~~~~~
Ikenosawa Lava
~~~~~~~~~~~~~~
Ikenosawagawa Lava
~~~~~~~~~~~~~~
Takakurayamashita Lava
~~~~~~~~~~~~~~
Tsuboyama Lava
~~~~~~~~~~~~~~
[ Lower ]

Kenashi volcano
[ Upper ]
--------------
Kenashiyama volcano
~~~~~~~~~~~~~~
Western basal volcanic rocks / Mizuo-Oiriyama volcano
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Tsuboyama - Mushiu, Nozawaonsen city, Shimotakai county, Nagano pref.

Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)