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Lower unit

Invalid synonym: Iruma Formation, Hata volcanic rocks

• Coherent formation
• Kakeya Caldera fill deposits
• Miocene (16.9 - 14.9 Ma, K-Ar)

• Sedimentary facies (Bottom): Terrestrial
• Lithofacies (Main): Basaltic andesite - andesite lava and pyroclastic rocks
• Lithofacies (Minor): Dacite - rhyolite lava and pyroclastic rocks
• Lithofacies (Bottom): Conglomerate, Sandstone, Mudstone

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Hata, Kakeya town, Unnan city, Shimane pref.

• Sawada et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.4, pp.267-284 DOI