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Hiraki Welded Tuff Yoshida and Kawata, 1987
Invalid synonym: Saikojiyama Formation
- Type locality (Upper): Kiyomizuji temple, Hiraki, Kato city, Hyogo prefecture
- Type locality (Lower): Kuroishi dam, Konda town, Nishiwaki city, Hyogo prefecture
- Volcanic rocks
- Late Cretaceous (72.7, 70.7 Ma, K-Ar)
- Correlation (Lower): Moshi Welded Tuff, Sakaino Formation, Tanjosan Tuff Breccia
- Intruded by: Shitodani Granite, Granite porphyry dike, Diorite porphyry dike, Diorite dike
- Sedimentary facies (Upper): Pyroclastic flow deposit
- Sedimentary facies (Middle): Lacustrine
- Lithofacies (Upper): Biotite rhyolite welded tuff (3 flow units)
- Lithofacies (Middle): Tuffaceous sandstone, Mudstone
- Lithofacies (Lower): Biotite rhyolite welded tuff
- Lithofacies (Lower, Minor): Tuff breccia
- Sedimentary structures (Upper): Cooling joint
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hiraki - Akitsu, Kato city, Hyogo pref.; Konda town - Nakahata - Hiraki mine, Nishiwaki city, Hyogo pref.; Ishido, Kaibara town, Tamba city, Hyogo pref.; Kitaota - Kanaya, Sannaan town, Tamba city, Hyogo pref.; Ajima - Furuichi, Tannan tonw, Tambasasayama city, Hyogo pref.; Shitodani, Konda town, Tambasasayama city, Hyogo pref.; Okawase, Sanda city, Hyogo pref.
- Kurimoto et al. (1993) Geology of the Sasayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
- Ozaki and Matsuura (1988) Geology of the Sanda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)