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Yokosuka Tephra Itoigawa, 1971

• Type locality: Yokosuka high school, Yokosuka town, Tokai city, Aichi prefecture
• Tephra
• Pliocene

• Lithofacies: Volcanic ash (3 units)
• Sedimentary structures (Upper): Graded bedding, Parallel stratification
• Sedimentary structures (Middle): Graded bedding, Parallel stratification, Convolute lamination
• Sedimentary structures (Lower): Graded bedding

• Host: Tokoname Formation
• Thickness: 1 - 2.7 m
• Thickness (Upper): 30 - 50 cm
• Thickness (Middle): 25 - 120 cm
• Thickness (Lower): 10 - 50 cm

• Distribution: Yokosuka high school, Yokosuka town, Tokai city, Aichi pref.
• Fossils: Plant leaves

• Yoshida and Ozaki (1986) Geology of the Handa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 98p. (in Japanese with English abstract 4p.)
• Sakamoto et al. (1986) Geology of the Nagoya-Nambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 3p.)