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Volcanic Fan IV Deposit Kano et al., 2025

Invalid synonym: Volcanic fan 3 deposit, Shimizuhara Pyroclastic Flow Deposit, Daisenji Debris Avalanche Deposit

• Type locality: Kanayadani, Hoki city, Saihaku county, Tottori prefecture
• Volcanic rocks
• middle Pleistocene (28 - 21 ka)

• Sedimentary facies: Debris flow deposit
• Sedimentary facies: Reworked deposits of Masumizuhara Pyroclastic Flow Deposit
• Lithofacies: Gravels, Sands
• Sedimentary structures: Graded bedding, Reversed graded bedding, Parallel stratification, Wavy stratification

• Thickness: ca. 20 - 30 m
• Upper limit: Unconformity (Amidagawa Pyroclastic Flow Deposits, Volcanic Fan V Deposit)
• Lower limit: Conformity (Eolian deposit intercalating AT tephra), Unconformity (Makibara Pyroclastic Flow Deposit, Sasaganaru Pyroclastic Flow Deposit, Masumizuhara Pyroclastic Flow Deposit, Older Volcanic Fan Deposit)

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

• Distribution: Kusatanihara - Shimizuhara - Mount Misen - Amidagawa river, Daisen city, Saihaku county, Tottori pref.; Ohara - Kanayadani - Besshogawa river - Oegawa river, Hoki 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