[ Top ] [ Japanese ]

Ky21 Tephra

Abbr.: Ky21

• Tephra
• Pliocene (4.2 Ma, FT)
• Correlation: Hk

• Lithofacies (Upper): Scoria
• Lithofacies (Lower): Hornblende-bearing augite hypersthene andesite tuff
• Sedimentary structures (Lower): Parallel stratification, Cross stratification, Graded bedding

• Host: Kiyosumi Formation
• Thickness (Upper): 10 - 22 cm
• Thickness (Lower): 150 - 195 cm

• Distribution: Chiba pref.

• Nakajima and Watanabe (2005) Geology of the Futtsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 102p. (in Japanese with English abstract 8p.)
• Nakajima et al. (1981) Geology of the Kamogawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 7p.)