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Akazawa Formation Watanabe, 1920
- Magma activity of a volcanic arc
- Deposition: early Cambrinan (533.0 Ma, Re-Os, 505, 507 Ma, SHRIMP)
- Metamorphism: Early - Late Cretaceous (118.0 - 96.0, K-Ar)
- Lithofacies (Upper): Epidote amphibolite
- Lithofacies (Lower): Amphibolite
- Lithofacies (Minor): Greenschist, Mica schist, Feldspathic schist
- Lithofacies (Protolith): Basaltic volcanic rocks (Lavas, Dykes), Volcaniclastic rocks
- Lithofacies (Protolith, Minor): Tuffaceous sediments, Porphyry dikes, Rhyolite, Granite
- Lithofacies (Granite): Calc-alkaline series (Volcanic arc granite)
- Lithofacies (Basalt): Tholeiitic - Calc-alkaline series (Island arc basalt)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Oiwa, Hitachi city, Ibaraki pref.; Fudo fall, Miyata river, Hitachi city, Ibaraki pref.; Torentsu river - Mount Ogitsu, Ogitsu village, Hitachi city, Ibaraki pref.
- Tagiri et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.6, pp.231-247, DOI
- Tagiri et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.1-20 DOI