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Aira-Tn Tephra Machida and Arai, 1976

Abbr.: AT

Invalid synonym: Tanzawa Pumice, TNP-1, Y-118

• Tephra
• Pleistocene (ca. 29 - 26 cal ka BP, ¹⁴C)
• Correlation: Ito Pyroclastic Flow Deposit

• Lithofacies: Vitreous tephra

• Source: Aira caldera, Kagoshima, Kyushu island, Japan
• Thickness: 3 - 8 cm
• Host: Hakoi Formation, Kanbara Group, Hirayama Loam, Nojiri Loam, Sasagamine Formation, Mure Formation, Kamishiro Lacustrine Terrace Deposits, Hata Loam, Younger Loam, Tachikawa Loam, Nanso II Terrace Deposits, Yoshifu Terrace Deposits, Shimokawai Peat Bed, Machikata Loam, Kitajima Formation, Sakaide Formation, Syuso Formation, Uwakai Formation
• Thickness: 8 cm or thinner
• Lower limit: Unconformity (Yanagisawa Tuff, Lower 2 Terrace Deposit)

• Distribution: all over Japan
• Distribution: Ichinomegata, Akita pref.; Oga city, Akita pref.; Wasezawa, Kitashiobara city, Yama county, Fukushima pref.; Chayashinden, Koga city, Ibaraki pref.; Bunnashi, Fukaya city, Saitama pref.; Chorakuji, Mutsuzawa city, Chosei county, Chiba pref.; Takiguchi, Shirahama town, Minamiboso city, Chiba pref.; Junikanno - Otozawa, Kurobe city, Toyama pref.; Tanayama, Asahi city, Shimoniikawa county, Toyama pref.; Nakayama - Asama hotspring, Matsumoto city, Nagano pref.; Kataoka, Shiojiri city, Nagano pref.; Kurokawado, Nagawa, Matsumoto city, Nagano pref.

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