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Jigokudani Accessory Tephra 4

• Tephra
• Holocene (between 3,380 - 3,000 cal yBP and 2,720 - 2,360 cal yBP, ¹⁴C)

• Lithofacies (Unit 4): Lithic fragments-bearing sands
• Lithofacies (Unit 3): Silt, Sands, Lithic fragments
• Lithofacies (Unit 2): Silt, Sands, Lithic fragments
• Lithofacies (Unit 1): Lithic fragments-bearing silt, Sands

• Mode of eruption: Phreatic
• Thickness: Several m
• Eruptive volume: 7.9 x 10⁶ m³

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

• Distribution: Raichozawa creek - Jigokudani valley - Lake Mikurigaike - Tengudaira, Tateyama city, Nakaniikawa county, Toyama pref.

• Nakano et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.37-48 DOI
• Harayama et al. (2000) Geology of the Tateyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 218p. (in Japanese with English abstract 6p.)