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HR-3 Tephra Hasegawa and Nakagawa, 2007

Abbr.: HR-3

• Type locality: Kuchoro river, Tsurui city, Akan county, Hokkaido
• Tephra
• Pleistocene

• Lithofacies: Glassy crystalline ash
• Sedimentary structures: Parallel stratification

• Thickness: ca. 30 - 50 cm
• Upper limit: Unconformity (Ak7-c)
• Lower limit: Unconformity (Ak7-d)

• Distribution: Kuchoro river, Tsurui city, Akan county, Hokkaido; Teshibetsu, Akan town, Kushiro city, Hokkaido

• Hasegawa et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.7, pp.366-381 DOI
• Hasegawa and Nakagawa (2007) Jour. Geol. Soc. Japan, vol.113, no.2, pp.53-72 DOI