Ochiai Sandstone Conglomerate Member

Ochiai Sandstone Conglomerate Member Kawamura et al., 2013

Type locality: Take river, Tenno - Shiraiwa, Ohasama town, Hanamaki city, Iwate prefecture
Coherent formation
Paleozoic volcanic island arc
middle Silurian
Intruded by: Tono Granodiorite

Lithofacies: Sandstone, Interbedded sandstone and mudstone, Mudstone, Siliceous tuff
Lithofacies (Minor): Conglomerate
Lithofacies (Bottom): Basalt - andesite volcanic breccia, Tuff breccia, Tuff

Thickness: 700 - 1,200 m
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
--------------
Nameirizawa Formation
::::::::::::::
Hayachine Complex
?--?--?--?--?-
[ Lower ]

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

Distribution: Take river, Tenno - Shiraiwa, Ohasama town, Hanamaki city, Iwate pref.; Orikabe pass - Orikabe river - Hayachine dam - Mount Kaminoiwayama - Mount Jidake, Ohasama town, Hanamaki city, Iwate pref.
Fossils: Radiolarians
Fossils: Trilobites (Encrinurus sp.), Gastropods, Brachiopods, Stromatoporoids (Clavidiction sp.), Crinoids, Bryozoa, Radiolarians, Red algae, Microfossils (Renalcis sp., Rothpletzella? sp.)
Fossils (Limestone gravels, Corals): Halysitids (Falsicatenipora shikokuensis, Halysites catenularius, Halysites kuraokaensis), Favoisitids (Multisolenia sp.), Heliolitids, Alveolitids, Rugosa (Cystiphyllum sp.)

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.)