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Kanayama Welded Tuff (Sudo et al., 1976) Iijima and Yoshikawa, 1994

Invalid synonym: Kanayama Rhyolites, Kitanagaoka Welded Tuff

• Type locality (Upper): Torinogo, Ota city, Gunma prefecture
• Type locality (Middle): Torinogo, Ota city, Gunma prefecture
• Type locality (Lower): Mount Shikadayama - Wada, Midori city, Gunma prefecture
• Type locality (Bottom): Hirosawa town, Kiryu city, Gunma prefecture
• Tephra
• Paleocene (60.3 Ma, FT; 58.3, 56,8 Ma, K-Ar)

• Sedimentary facies: Terrestrial
• Sedimentary facies (Bottom): Fluvial
• Lithofacies: Rhyolite Welded Tuff
• Lithofacies (Bottom): Conglomerate
• Sedimentary structures: Columnar joint

• Thickness: ca. 200 - 250 m or thicker
• Thickness (Upper - Middle): 200 m or thicker
• Thickness (Lower): ca. 30 m
• Thickness (Bottom): ca. 20 m
• Upper limit: Unconformity (Hirosawa Conglomerate, Yabuzuka Formation)
• Lower limit: Unconformity (Gyodosan Complex)

• Distribution: Torinogo, Ota city, Gunma pref.; Mount Shikadayama - Wada, Midori city, Gunma pref.; Hirosawa town, Kiryu city, Gunma pref.; Mount Chausuyama, Kiryu city, Gunma pref.; Mount Tennozan - Mount Higashitakatsubo, Ota city, Gunma pref.

• Ito et al. (2022) Geology of the Kiryu and Ashikaga District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)