Yarisawa Breccia

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Yarisawa Breccia Harayama, 1990

Type locality: Yarisawa creek, Matsumoto city, Nagano prefecture
Coherent formation
early Pleistocene (1.7 Ma, FT)
Intruded by: Takidani Granodiorite, Diorite porphyry

Lithofacies: Breccia
Lithofacies (Upper, Minor): Conglomerate, Sandstone, Pumiceous lapilli tuff, Tuff breccia, Rhyolite welded tuff

Upper limit: Unconformity (Maehotakadake Welded Tuff)
Lower limit: Unconformity (Kitakama Body, Okumarusawa Granite, Okumatashiro Granite, Ichinosawa Granite, Ariake Granite)

Hotaka Andesites
[ Upper ]
~~~~~~~~~~~~~~
Minamidake Tuff Breccia
--------------
Maehotakadake Welded Tuff
~~~~~~~~~~~~~~
Yaemonzawa Lava
~~~~~~~~~~~~~~
Senjosawa Breccia
~~~~~~~~~~~~~~
Yarisawa Breccia
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Yarisawa creek - Kitakama ridge - Nishikama ridge - Higashikama ridge - Mount Akazawayama - Yaridaira - Migimatadani valley - summit of Mount Okumaruyama, Matsumoto city, Nagano pref.

Harayama et al. (1991) Geology of the Yarigatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 190p. (in Japanese with English abstract 8p.)
Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)