Orikabetoge Formation

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Orikabetoge Formation Yamazaki et al., 1984

Type locality: Orikabe pass, Shiwa city - Ohasama town, Hanamaki city, Iwate prefecture
Coherent formation
Paleozoic volcanic island arc
Silurian - Devonian

Lithofacies: Clastic rocks

Thickness: 1,500 m or thicker
Upper limit: Unconformity (Yamaya Formation)
Lower limit: Conformity (Nameirizawa Formation)

Orikabetoge Formation
[ Upper ]
?--?--?--?--?-
Shiraiwa Sandstone Mudstone Member
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Ochiai Sandstone Conglomerate Member
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[ Lower ]

South Kitakami Belt (Osako, Iwate pref.)
[ Upper ]
?--?--?--?--?-
Uchikawame Formation
?--?--?--?--?-
Funakubo Formation / Odagoe Formation
?--?--?--?--?-
Orikabetoge Formation
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Nameirizawa Formation
::::::::::::::
Hayachine Complex
?--?--?--?--?-
[ Lower ]

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

Distribution: West of Mount Hayachine, Iwate pref.
Distribution: Orikabe pass, Shiwa city - Ohasama town, Hanamaki city, Iwate pref.; Hayachine dam, Osako town, Hanamaki city, Iwate pref.
Fossils (Table corals): Halysitids (Halysites kuraokensis), Favisitids, Heliolitids, Alveolitids
Fossils: Rugosa, Stromatopods, Crinoids, Bryozoans, Brachiopods, Trilobites, Red algae, Microfossils (Renalcis, Rothpletzella)

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