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Usuginu Conglomerate

A type of the characteristic conglomerate typically included in Toyoma Formation

• Coherent formation
• middle Permian

• Sedimentary facies: Marine
• Lithofacies: Conglomerate
• Lithofacies: Well rounded pebble, cobble and/or boulder conglomerate mainly composed of plutonic rocks, volcanic rocks, contact metamorphosed rocks, and limestone

• Thickness: 20 m or thinner

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

• Distribution: Mount Takauto - Miyahata, Fujisawa town, Ichinoseki city, Iwate pref.; Satetsu river - Numata - Idozawa, Ichinoseki city, Iwate pref.; Mount Hiryu, Tassobe, Miyamori town, Tono city, Iwate pref.; Mount Tsuchikura, Hanamaki city, Iwate pref.; Miyagi pref.

• Ehiro and Morikiyo (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.47-67 DOI
• Takeuchi and Mikoshiba (2002) Geology of the Senmaya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 3p.)
• Kamada and Takizawa (1992) Geology of the Osu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 4p.)
• Hirokawa and Yoshida (1956) Ohazama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 31p. (in Japanese with English abstract 9p.)