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Akashio Loam Hanaoka and Toyono Collaborative Research Group, 1985

Invalid synonym: Sasazawa Scoria Group

• Loam
• middle Pleistocene
• Correlation: middle Maibara Loam, Akasaka Formation

• Lithofacies (Upper) Pumice, Volcanic conglomerate
• Lithofacies (Middle) Interbedded volcanic conglomerate and pumiceous volcanic ash
• Lithofacies (Lower) Interbedded volcanic conglomerate and volcanic ash

• Source: Iizuna volcano, Kurohime volcano
• Thickness: 18 - 20 m
• Thickness (Upper): 4 m
• Thickness (Middle): 8 - 9 m
• Thickness (Lower): 6.5 - 7.5 m

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

• Distribution: Nagano pref.
• Tephra: Oshika Scoria Group

• Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)
• Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)
• Akahane et al. (1992) Geology of the Nakano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 106p. (in Japanese with English abstract 4p.)