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Akusa Formation (Yoshida and Kawata, 1987) Kurimoto et al., 1993

Invalid synonym: Akusa Welded Tuff, upper Hie Formation

• Type locality: Akusa - Okuyama, Sannan town, Tamba city, Hyogo prefecture
• Volcanic rocks
• Late Cretaceous
• Interfingered: Kamogawa Formation

• Lithofacies: Biotite rhyolite welded tuff, Lava, Lapilli tuff, Sandstone, Conglomerate
• Lithofacies (Bottom): Conglomerate

• Source: Akusa, Hyogo pref.
• Thickness: ca. 350 - 850 m
• Distribution (Diameter): ca. 8 km
• Lower limit: Unconformity (Oyamashimo Formation, Tamba Belt)

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

• Distribution: Akusa - Okuyama - Sasaba - Ibara - Nosaka - Hatauchi - Ishido, Sannan town, Tamba city, Hyogo pref.; Sasayama river, Kamitaki - Shimotaki, Tamba city, Hyogo pref.; Shimoogura - Murotani - Aguta - Oshinya, Kaibara town, Taamba city, Hyogo pref.; Fukuda - Asaka - Kamono, Hikami town, Tamba city, Hyogo pref.; Muranaka - Konae, Kurodasho town, Nishiwaki city, Hyogo pref.; Mount Matsuoyama - Konosaka, Tambasasayama city, Hyogo pref.

• Kobayashi and Goto (2008) Jour. Geol. Soc. Japan, vol.114, no.11, pp.577-586 DOI
• 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.)