Kosha Pumice Flow Deposit

[ Top ] [ Japanese ]

Kosha Pumice Flow Deposit Togashi and Akahane, 1991

Type locality: Fukazawa dam, Uki, Yamanouchi city, Shimoakai county, Nagano prefecture
Tephra
Pleistocene
Correlation: NP-e

Lithofacies: Pyroxene andesite lava, Volcanic ash

Source: Mount Iimori
Thickness: 0.15 - 1.8 m
Upper limit: Unconformity (Volcanic fan deposit, Hokushin Loam)
Lower limit: Unconformity (Kosha Lithic Pyroclastic Flow Deposit)

Kosha volcano
[ Upper ]
+__+__+__+__+_
Iimoriyama Lava
~~~~~~~~~~~~~~
Kosha Pumice Flow Deposit
~~~~~~~~~~~~~~
Mitsugoyama Lava
~~~~~~~~~~~~~~
Kosha Lithic Pyroclastic Flow Deposit
~~~~~~~~~~~~~~
Koshashukazantai Lava
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Fukazawa dam, Uki, Yamanouchi city, Shimoakai county, Nagano pref.; Mount Kosha, Nakano city - Yamanouchi city - Kjimadaira city, Shimoakai county, Nagano pref.; Mount Okuteyama, Nakano city, Nagano pref.

Akahane et al. (1992) Geology of the Nakano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 106p. (in Japanese with English abstract 4p.)