[ Top ] [ Japanese ]

Iu Formation (Shiida and Shibata, 1968)

Invalid synonym: lower Oyamado Formation

• Type locality: Iu, Tsuge, Nara city, Nara prefecture
• Coherent formation
• Miocene

• Lithofacies: Conglomerate, Breccia
• Lithofacies (Minor): Sandstone, Siltstone, Coal
• Sedimentary structures: Channel structure

• Thickness: 5 - 150 m
• Upper limit: Transitional (Sogo Formation)
• Lower limit: Unconformity (Ryoke Metamorphic Rocks, Granite)

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

• Distribution: Iu - Oyamato - Sogo - Shiraishi, Tsuge, Nara city, Nara pref.; Mukoji - Okubo - Tenmadai, Uda city, Nara pref.

• Sato et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.53-69 DOI
• Nishioka et al. (2001) Geology of the Sakurai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 141p. (in Japanese with English abstract 5p.)