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Kurooyama Formation Yamamoto et al., 2002
- Type locality: Kakehashi, Yamasaki town, Shiso city, Hyogo prefecture
- Volcanic rocks
- Large scale caldera-fill deposit
- Late Cretaceous (71.9 Ma, K-Ar)
- Intruded by: Haga Body, Biotite hornblende tonalite porphyry sills, Hornblende dacite dikes, Hornblende diorite dikes, Biotite granite, Dacite dikes
- Sedimentary facies: Rhyolite pyroclastic flow deposits
- Sedimentary facies (Minor): Debris avalanche deposits
- Lithofacies: Welded lapilli tuff
- Lithofacies (Minor): Breccia
- Sedimentary structures: Columnar joints
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kakehashi - Saiki - Nonosumi?, Shiso city, Hyogo pref.
- Yamamoto et al. (2002) Geology of the Yamasaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 48p. (in Japanese with English abstract 4p.)