Kamaishi Formation

Kamaishi Formation Yoshida, 1961

Type locality: Shinkawara - Sotoyama, Unosumai town, Kamaishi city, Iwate prefecture
Accretionary complex
Deposition (Limestone): early Permian (Fusulinids)
Deposition (Chert): early Permian - Triassic (Conodonts)
Accretion: Jurassic
Intruded by: Goyosan Pluton (Gabbroic rocks, Yoshihama type)

Sedimentary facies: Marine
Lithofacies: Slate, Chert
Lithofacies (Minor): Sandstone, Andesitic agglomerate, Tuff breccia, Limestone

Thickness: approxemately 3,000 m
Distribution (East-West): ca. 5 km
Distribution (South-North): ca. 50 km

Kuzumaki - Kamaishi Sub-belt (Miyako, Iwate pref.)
[ Upper ]
/--/--/--/--/-
Hanawa Formation
/--/--/--/--/-
Kamaishi Formation
/--/--/--/--/-
Kuribayashi Formation
/--/--/--/--/-
[ Lower ]

North Kitakami Belt
[ Upper ]
/--/--/--/--/-
Kuzumaki - Kamaishi Sub-belt
/--/--/--/--/-
Akka - Tanohata Sub-belt
/--/--/--/--/-
[ Lower ]

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

Distribution: Shinkawara - Sotoyama, Unosumai town, Kamaishi city, Iwate pref.; Toyomane, Yamada city, Shimohei county, Iwate pref.; Mount Mainemori - Mount Itagi - Mount Takanosu - Kogawa - Ryoishi - Mount Kamomemori - Sangan island - Mizumi, Kamaishi city, Iwate pref.; Myojindo - Shinkama, Sanriku town, Ofunato city, Iwate pref.
Fossils: Crinoids, Calcareous algae
Fossils (Conodonts): Sweelognathus iranicus, Gondolella sp.
Fossils (Limestone, Fusulinids): Codonofusiella sp., Pseudofusulina cf. vulgaris, Pseudoschwagerina sp., Textularia sp.
Ore: Bedded manganese deposit

Nishioka and Yoshikawa (2004) Geology of the Ryori District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 49p. (in Japanese with English abstract 3p.)
Yoshida and Katada (1984) Geology of the Miyako District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 44p. (in Japanese with English abstract 6p.)
Yoshida and Katada (1964) Otsuchi and Karodake, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 30p. (in Japanese with English abstract 6p.)
Yoshida (1961) Kamaishi, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 26p. (in Japanese with English abstract 5p.)