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Yakushigawa Formation
Invalid synonym: upper part of Koguro Formation
- Coherent formation
- Paleozoic volcanic island arc
- Ordovician? - Silurian (425 Ma, U-Pb)
- Correlation: Nameirizawa Formation
- Lithofacies: Terrestrial clastic rocks
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: East of Mount Hayachine, Iwate pref.
- Kawamura et al. (2013) Geology of the Hayachine San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
- Uchino et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.141-157 DOI