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Older Volcanic Fan Deposit Kano et al., 2025

Invalid synonym: Mizuguchi Tuff Breccia Formation, Volcanic Fan 6 Deposit, Fukuichi Pumice Flow Deposits

• Type locality: Tottori prefecture
• Volcanic rocks
• middle Pleistocene (1 - 0.2 Ma)
• Interfingered: Uenohara Lava

• Sedimentary facies: Debris flow deposit
• Lithofacies: Dacitic breccia
• Lithofacies (Minor): Tuffaceous sands, Silt
• Sedimentary structures (Lower): Reversed graded bedding

• Thickness: ca. 50 - 200 m
• Upper limit: Unconformity (Volcanic Fan I Deposit, Volcanic Fan III Deposit, Volcanic Fan IV Deposit, Volcanic Fan V Deposit, Masumizuhara Pyroclastic Flow Deposits)
• Lower limit: Unconformity (Tsuruta Basalt, Hoden Basalt, Iwatate Basalt, Ebi Granite, Neu Granite)

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

• Distribution: Oegawa river, Iwatate, Hoki city, Saihaku county, Tottori pref.; summit of Mount Daisen, Daisen city, Saihaku county, Tottori pref.

• Kano et al. (2025) Geology of the Yonago District (2nd Ed.), Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 84p. (in Japanese with English abstract 4p.)
• Yamamoto (2017) Bull. Geol. Surv. Japan, vol.68, no.1, pp.1-16 DOI
• Sawada et al. (2009) Jour. Geol. Soc. Japan, vol.115, Supplement, pp.51-70 DOI