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AS-4 Tephra

Abbr.: AS-4

• Tephra
• Pleistocene

• Lithofacies: Scoria

• Host: Tachikawa Loam
• Thickness: ca. 10 cm

• Distribution: Tsunada, Ichinomiya city, Chosei county, Chiba pref.; Takiguchi, Shirahama town, Minamiboso city, Chiba pref.

• Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
• 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.)