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Upper Mashu Tephra Formation
Abbr.: Ma
- Type locality: Hokkaido
- Tephra
- Holocene (3.5 - 1.0 ka)
- Sedimentary facies: Terrestrial
- Lithofacies: Felsic pumice and tuff
- Upper Mashu Tephra Formation (Central cone building stage)
- [ Upper ]
- ~~~~~~~~~~~~~~
- Ma-b
- ~~~~~~~~~~~~~~
- Ma-c
- ~~~~~~~~~~~~~~
- Ma-d
- ~~~~~~~~~~~~~~
- Ma-e
- ~~~~~~~~~~~~~~
- [ Lower ]
- Upper Mashu Tephra Formation (Caldera forming stage)
- [ Upper ]
- ~~~~~~~~~~~~~~
- Ma-f
- ~~~~~~~~~~~~~~
- Ma-g
- ~~~~~~~~~~~~~~
- Ma-h
- ~~~~~~~~~~~~~~
- Ma-i
- ~~~~~~~~~~~~~~
- Ma-j
- ~~~~~~~~~~~~~~
- Ma-k, 0.5 km3
- ~~~~~~~~~~~~~~
- Ma-l
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Hasegawa et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.8, pp.369-390 DOI