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Kosaji Tephra Takaya, 1963

• Type locality: Nishide, Koka city, Shiga prefecture
• Tephra
• Pliocene
• Correlation: TMD 2

• Lithofacies: Vitreous volcanic ash

• Host: Yoshinaga Alternation Member, Koka Formation, Sajigawa Member, Sayama Member, Kaigake Member
• Thickness: 20 - 60 cm

• Distribution: Yasugawa river, Yoshinaga, Konan city, Shiga pref.; Jinbo - Kosaji - Nishide - Iwamuro, Koka city, Shiga pref.; Kaigake - Mount Kodake, Hino city, Gamo county, Shiga pref.

• Nakano et al. (2003) Geology of the Minakuchi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 83p. (in Japanese with English abstract 3p.)
• Yoshida et al. (2003) Geology of the Omi-Hachiman District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 72p. (in Japanese with English abstract 3p.)
• Miyamura et al. (1981) Geology of the Kameyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 128p. (in Japanese with English abstract 9p.)