[ Top ] [ Japanese ]
Upper part Geshi and Takeuchi, 2012
- Volcanic rocks
- early Pleistocene (ca. 2.4 - 0.9 Ma; 1.7 Ma, FT)
- Lithofacies: Tholeiite, Calc-alkaline
- Lithofacies: Andesite volcanic breccia, Tuff breccia
- Lithofacies (Minor): Tuffaceous sandstone, Conglomerate, Scoriaceous pyroclastic flow deposit, Pumice flow deposit, Pamice fall deposit
- Thickness: 0 - ca. 500 m
- Thickness (Pyroclastic flow deposit): A few dozen m
- Thickness (Pumice flow deposit): ca. 15 m
- Lower limit: Unconformity (Chausuyama Welded Tuff Member)
- Upper part
- [ Upper ]
- --------------
- Jizotoge Formation = Hanamagari volcano
- --------------
- Chojakubo Member
- --------------
- Aiyoshi Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kamisatomi town, Takasaki city, Gunma pref.; Aiyoshi - Hosoo, Kurabuchi town, Takasaki city, Gunma pref.
- Geshi and Takeuchi (2012) Geology of the Haruna San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)