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Aso-4 Tephra
Abbr.: Aso-4
Synonym: Aso-4 Pyroclastic Flow Deposits, Aso-4B (pyroclastic flow deposit at the top)
- Volcanic rocks
- late Pleistocene (89 ka, K-Ar; 80 ka, U-Th; 86 - 90 ka, 18O)
- Lithofacies: Pyroclastic flow deposits
- Aso-4 Pyroclastic Flow Deposits
- [ Upper ]
- ~~~~~~~~~~~~~~
- Unit 4
- ~~~~~~~~~~~~~~
- Unit 3
- ~~~~~~~~~~~~~~
- Unit 2
- ~~~~~~~~~~~~~~
- Unit 1
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: all over Japan
- Distribution: Mashiki city, Kamimashiki county, Kumamoto pref.; Anden seashore, Oga city, Akita pref.; Futamata forest road, Tenei city, Iwase county, Fukushima pref.
- Ito et al. (2022) Geology of the Kiryu and Ashikaga District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
- Okuno (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.41-53 DOI
- Nakazawa et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.5, pp.347-359 DOI
- Ueki et al. (2013) Geology of the Hachioji District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 137p. (in Japanese with English abstract 6p.)
- Takagi et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.1, pp.1-14 DOI
- Yamamoto (1999) Geology of the Tajima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 8p.)
- Kimura et al. (1998) Geology of the Kyoto-Tohokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 89p. (in Japanese with English abstract 5p.)