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Towada-a Tephra

Abbr.: To-a

• Tephra
• Holocene (AD 915, ¹⁴C)
• Contemporaneous heterotopic facies: Towada-Kemanai Pyroclastic Flow Deposit

• Sedimentary facies: Terrestrial
• Lithofacies: Volcanic ash

• Mode of eruption: Magmatic
• Source: Towada caldera

• Distribution: Mount Iwate, Iwate pref.; Sainokawara, Mount Chokai, Akita pref.; Mount Hakkoda, Aomori pref., Ninomegata maar - Sannomegata maar, Oga city, Akita pref.

• Itoh et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.4, pp.271-296 DOI
• 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.)
• Takarada and Muraoka (2004) Geology of the Hakkoda San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 86p. (in Japanese with English abstract 4p.)