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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, Middle II Terrace Deposits, Younger Loam, Tachikawa Loam, Nanso II Terrace Deposits, Yoshifu Terrace Deposits, Shimokawai Peat Bed, Machikata Loam, Lower Terrace Deposits, Hara Formation, Lower Terrace Deposits, Lower I Terrace Deposits, 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.

• 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.)
• Utsunomiya and Ooi (2019) Geology of the Kazusa-Ohara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
• Okuno (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.41-53 DOI
• Nagamori et al. (2018) Geology of the Itoigawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 75p. (in Japanese with English abstract 3p.)
• Furukawa et al. (2018) Geology of the Azuma Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 74p. (in Japanese with English abstract 3p.)
• Takeuchi et al. (2017) Geology of the Tomari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 121p. (in Japanese with English abstract 4p.)
• Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
• Kamoi et al. (2016) Geology of the Niigata and Uchino District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 90p. (in Japanese with English abstract 2p.)
• Naya and Yasuhara (2014) Geology of the Konosu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 3p.)
• Wakita et al. (2013) Geology of the Kyoto-Tonambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 124p. (in Japanese with English abstract 3p.)
• Ueki et al. (2013) Geology of the Hachioji District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 137p. (in Japanese with English abstract 6p.)
• Kano et al. (2011) Geology of the Toga and Funakawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
• Nakazawa and Tanabe (2011) Geology of the Noda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 72p. (in Japanese with English abstract 3p.)
• Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)
• Hara et al. (2010) Geology of the Mitsumine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)
• Nakazato and Nakazawa (2007) Jour. Geol. Soc. Japan, vol.113, no.12, pp.628-635 DOI
• Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)
• Kawakami and Shishikura (2006) Geology of the Tateyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 5p.)
• Komatsubara et al. (2004) Geology of the Kisarazu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 64p. (in Japanese with English abstract 3p.)
• Nakazawa and Endo (2002) Geology of the Omiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 41p. (in Japanese with English abstract 3p.)
• Nakano et al. (1995) Geology of the Norikuradake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 139p. (in Japanese with English abstract 4p.)
• Imoto et al. (1989) Geology of the Kyoto-Seihokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 84p. (in Japanese with English abstract 4p.)
• Oka et al. (1984) Geology of the Tokyo-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)