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Old Somma Deposits

• Volcanic rocks
• Middle Pleistocene

• Sedimentary facies: Terrestrial
• Lithofacies: Basalt - Andesite
• Lithofacies (Main): Volcanic breccia (a matrix of tuffaceous sandstone)
• Lithofacies (Minor): Lavas

• Lower limit: Conformity (Shiozawa Formation), Unconformity (Hata Formation, Seto Formation), Interfingered (Ikudo Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: JIzodo - Ayusawa river, Yamakita city, Ashigarakami county, Kanagawa pref.
• Tephra: Tama Loam (middle - lower)

• Odawara et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.135-152 DOI