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Bunamoribokujo Welded Tuff Sudo, 1992
- Type locality: Akita prefecture
- Tephra
- Pleistocene (1.5 - 0.7 Ma, K-Ar)
- Source: pre-Akitayakeyama caldera, Akita pref., Japan
- Thickness: 5 - 20 m or thicker
- Distribution (East-West): ca. 50 km
- Distribution (North-South): ca. 50 km
- Volume: ca. 50 km3
- Upper limit: Unconformity (Takinosawa 6 Lava, Oshiromori Volcanic Products, Yasemori Lava, Kensomori Lava, Obukadake Lava, Kamotayamagairinzan Lava, Lower Onagane Lava, Komonomori Agglomerate, Sumikawa Lava, Matsukawa Andesite, 1162.3m-yama Lava, Ainaizawa Formation)
- Lower limit: Unconformity (Kurasawayama Welded Tuff)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Akita pref.; Arasawa creek, Shizukuishi city, Iwate county, Iwate pref.
- Nakaya et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.7, pp.457-473 DOI
- Kano et al. (2012) Geology of the Aniai District, 2nd Edition, 1:50,000 Quadrangle Series, Geological Survey of Japan, AIST, 59p. (in Japanese with English abstract 4p.)
- Suto and Ishii (1987) Geology of the Shizukuishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 142p. (in Japanese with English abstract 5p.)