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V290 Tephra Mizuno et al., 1999

• Tephra
• Pleistocene
• Correlation: Kenjogaoka I (Osaka Group, 2.4 - 2.3 Ma)

• Lithofacies: Vitreous volcanic ash

• Thickness: ca. 20 cm
• Host: Shobudani Formation

• Distribution: Wakayama pref.

• Makimoto et al. (2004) Geology of the Kokawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 89p. (in Japanese with English abstract 4p.)