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Echi Formation (Kanagawa prefecture, 1955) Ueki et al., 2013

Invalid synonym: Oba Gravel, Shimoniwa Formation

• Type locality: Sagami river, Kamiechi, Atsugi city, Kanagawa prefecture
• Coherent formation
• Higher terrace deposit
• middle Pleistocene (ca. 0.2 Ma)

• Sedimentary facies: Fluvial
• Sedimentary facies: Buried valley-fill deposit
• Lithofacies: Gravels, Sands
• Lithofacies (Minor): Silt, Scoria, Peat
• Sedimentary structures: Parallel stratification

• Thickness: 70 m
• Upper limit: Unconformity (Zama Hills Terrace Deposit, Sagamihara Terrace Deposit, Nakatsuhara Terrace Deposit, Tanahara Terrace Deposit, Minahara Terrace Deposit, Shimosueyoshi Formation, Sogayama Formation, Zoshiki Loam, Shimoniwa Loam)
• Lower limit: Unconformity (Shioda Formation)

• Distribution: Kamiechi - Tanasawa, Atsugi city, Kanagawa pref.; Taima - Hayamajima, Sagamihara city, Kanagawa pref.; Nakatsu, Aikawa city, Aiko county, Kanawaga pref.; Oba castle, Oba, Fujisawa city, Kanagawa pref.; Nakai city, Ashigarakami county, Kanagawa pref.
• Tephra: Tanasawa Tephra

• 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.)