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YK Tephra

Abbr.: YK

• Type locality: Takiguchi, Shirahama town, Minamiboso city, Chiba prefecture
• Tephra
• Pliocene - Pleistocene

• Lithofacies (Upper): Vitreous volcanic ash
• Lithofacies (Middle): Pumice
• Lithofacies (Lower): Pumice

• Host: Mera Formation
• Thickness (Upper): ca. 11 cm
• Thickness (Middle): 5 cm
• Thickness (Lower): 0 - 0.3 cm

• Distribution: Takiguchi, Shirahama town, Minamiboso city, Chiba pref.; Hata - Mera fishing harbour, Tateyama city, Chiba pref.

• Kawakami and Shishikura (2006) Geology of the Tateyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 5p.)