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Mamahahadake volcano group
- Volcanic rocks
- late Pleistocene (ca. 90 - 80 ka)
- Sedimentary facies: Caldera-fill deposit
- Lithofacies: Dacite lava, Pyroclastic flow deposit, Rhyolite pumice fall deposit, Pyroclastic flow deposit
- Lithofacies: Augite hypersthene andesite lava (A flow unit)
- Source: Mount Mamakodake
- Thickness: 30 - 40 m
- Distribution (Caldera, Diameter): 5 - 6 km
- Eruptive volume: ca. 60 km3 or more
- Running distance: 15 km
- Upper limit: Unconformity (Nigorigo volcano, Okunoin volcano)
- Younger Ontake Tephra Group (Lower)
- [ Upper ]
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- On-Fk
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- On-Pm3
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- On-Pm3'
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- On-Pm2'
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- On-Pm2
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- On-Pm1
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- On-Pm1'
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Mamakodake - Mount Miurayama, Gifu pref. - Nagano pref.; Lake Takanenorikurako, Takane town, Takayama city, Gifu pref.
- Takeuchi et al. (1998) Geology of the Kiso-Fukushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)
- Nakano et al. (1995) Geology of the Norikuradake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 139p. (in Japanese with English abstract 4p.)
- Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 9p.)