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Nawa Pyroclastic Flow Deposit (Ota, 1962) Tsukui, 1984

Invalid synonym: Nawa Pumice Flow Deposit

• Type locality: Nawa, Daisen city, Saihaku county, Tottori prefecture
• Volcanic rocks
• middle Pleistocene (100 ka, FT)

• Sedimentary facies: Pyroclastic flow deposit
• Sedimentary facies: Block-and-ash flow
• Lithofacies: Biotite-orthopyroxene-hornblende dacite
• Lithofacies (Minor): Tree trunks, Wood fragments
• Sedimentary structures: Unclear lamination, Reversed graded bedding

• Source: Furikosen Lava Dome
• Eruptive volume: 1.3 km³ DRE
• Thickness: 5 - 50 m
• Upper limit: Conformity (Eolian deposit intercalating SK), Unconformity (Masumizuhara Pyroclastic Flow Deposits, Volcanic Fan II Deposit)
• Lower limit: Unconformity (Eolian deposit intercalating DMP, 0.13 Ma, Mikuriya Sand and Gravel Bed)

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

• Distribution: Nawa - Shimoichi - Amidagawa river, 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
• Kano and Nakano (1985) Geology of the Mihonoseki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 28p. (in Japanese with English abstract 3p.)
• Ota (1962) Akasaki & Daisen, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 37p. (in Japanese with English abstract 3p.)