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Karosan Formation (Kuroda and Ogura, 1960) Fujita et al., 1988

Invalid synonym: Kitazawa Formation

• Type locality: eastern flank of Mount Karo, Soma city, Fukushima prefecture
• Coherent formation
• Age unknown (Pre-Jurassic, younger than Wariyama Formation)

• Lithofacies: Sandstone
• Lithofacies (Minor): Interbedded sandstone and shale, Shale
• Sedimentary structures: Parallel stratification

• Thickness: 500 m or thicker
• Upper limit: Unconformity (Awazu Formation, Kuboma Formation, Yamashita Formation), Abut unconformity (Lower Member of Kaneyama Formation, Yoshigasawa Formation)

• Distribution: Hatsuno - Mount Karo, Soma city, Fukushima pref.; Myotsu pass - Basen pass - Kosai pass, Kakuda city - Yamamoto city, Watari county, Miyagi pref.; Fukuda pass, Marumori city, Igu county, Miyagi pref.; Mount Jizomori - Mount Goshadan, Shinchi city, Soma county, Fukushima pref.

• Taketani and Osozawa (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.68-81 DOI
• Tsuchiya et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.154-167 DOI
• Yanagisawa et al. (1996) Geology of the Somanakamura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 9p.)
• Fujita et al. (1988) Geology of the Kakuda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 99p. (in Japanese with English abstract 9p.)