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Kurasawayama Welded Tuff Sudo, 1992
Invalid synonym: Rhyolite Welded Tuff 4, Shinbesawa Dacite, Kurasawayama Tuff Member, Tazawa Acidic Volcanic Rocks, Tazawa Formation, Owasegawa Tuff
- Type locality: Mount Kurasawa, Senboku city, Akita prefecture
- Tephra
- Pleistocene (2 Ma; 2.5 - 1.7 Ma, K-Ar)
- Correlation: Tamagawa-R4 Tephra, HS C
- Lithofacies: Quartz orthopyroxene hornblende-bearing rhyolite tuff
- Lithofacies (Minor): Scoria volcanic lapilli
- Source: pre-Akitayakeyama caldera, Akita pref., Japan
- Thickness: ca. 10 - 150 m
- Distribution (East-West): ca. 50 km
- Distribution (North-South): ca. 50 km
- Volume: ca. 130 km3
- Upper limit: Unconformity (Bunamoribokujo Welded Tuff, Ichinomatakawa Lavas, Takakurayama Volcanic Products)
- Lower limit: Unconformity (Kotamagawa Welded Tuff, Kitanomatasawa Formation, Yamatsuda Formation, Masuzawa Formation, Koshitomaezawa Formation, Kitamatagawa Formation, Osawa Formation)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Kurasawa, Senboku city, Akita pref.; Onokusa creek, Tazawako, Senboku city, Akita pref.; Hinokinaimata creek, Nishiki town, Senboku city, Akita pref.; Hashiba - Mount Takakura, 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.)