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Arima Group Kasama, 1959

Invalid synonym: Ikuno Group

• Volcanic rocks
• Late Cretaceous (72.7 - 70.7 Ma, K-Ar)
• Intruded by: Diorite sill, Quartz porphyry dyke, Granite porphyry dyke

• Sedimentary facies: Neutral - Acidic large-scale volcanic rocks
• Lithofacies (Upper, Unit 4,5): Rhyolite tuff
• Lithofacies (Upper, Minor): Rhyolite lava, Welded tuff
• Lithofacies (Middle, Unit 3,5): Rhyolite lava
• Lithofacies (Lower, Unit 2): Andesite tuff, Lava
• Lithofacies (Bottom, Unit 1): Andesite tuff

• Thickness (Bottom): 10 m or thinner
• Distribution (Length): 100 km or more
• Upper limit: Unconformity (Shitsukawa-Kagobo Formation, Osaka Group)
• Lower limit: Unconformity (Sasayama Group, Hoyo Quartz Diorite, Gabbro Unit, Ebara Formation, Furuichi Complex)

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

• Distribution: Tanbasasayama city - Kobe city - Kameyama city, Hyogo pref.; Aogaki town - Hikami town - Nashikitoge pass - Osano, Tanba city, Hyogo pref.

• Hayashi et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.9, pp.747-764 DOI
• 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.)
• Imoto et al. (1991) Geology of the Sonobe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 4p.)
• Kurimoto and Makimoto (1990) Geology of the Fukuchiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 97p. (in Japanese with English abstract 5p.)