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Miyagase Formation Mikami, 1955
- Type locality (Submerged): Nakatsugawa river, Mukaihara, Hanbara, Aikawa city - Miyagase, Kiyokawa city, Aiko county, Kanagawa prefecture
- Volcanic rocks
- Trough-fill deposit at the collision boundary between Oceanic arc of Paleo-Izu-Bonin arc (Ocean crust) and Honshu arc (Island arc)
- late Miocene
- Sedimentary facies: Marine
- Sedimentary facies: Reworked pyroclastic rocks (Epiclastic)
- Sedimentary facies (Minor): Dacite submarine pyroclastic flow deposit
- Lithofacies: Basalt - Andesite volcanic breccia
- Lithofacies (Minor): Tuff breccia, Lapilli tuff, Dacite pumice tuff, Lapilli tuff, Sandstone, Mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mukaihara, Hanbara, Aikawa city, Aiko county, Kanagawa pref.; Miyagase - Susugaya - Horindo forest road - Miyano, Kiyokawa city, Aiko county, Kanagawa pref.; Kamiyato, Atsugi city, Kanagawa pref.
- Fossils (Calcareous nannofossils): Discoaster berggrenii, Discoaster quinqueramus
- 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.)
- Oka et al. (1979) Geology of the Fujisawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 5p.)