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Suruga Gravels Formation

• Coherent formation
• River bed sediments of Old Sakawa river
• Holocene

• Sedimentary facies: Fluvial
• Lithofacies: Gravels, Water-laied ash

• Thickness: 100 m or thicker
• Lower limit: Unconformity (Old Somma Deposit of Hakone volcano, Shiozawa Formation)

• Distribution: Shiozawa, Yamakita city, Ashigarakami county, Kanagawa pref.; Ikudo - Nakajima, Oyama city, Sunto county, Shizuoka pref.
• Tephra: On-Pm1 (Ontake-Daiichi, ca. 100 ka), Hk-OP (Hakone-Obaradai Pumice, 85 - 80 ka)

• Odawara et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.135-152 DOI
• Tanikawa and Shimamoto (2007) Jour. Geol. Soc. Japan, vol.113, no.1, pp.27-32 DOI