Uchikawame Formation

Uchikawame Formation Okami et al., 1986

Type locality: Narabana, Ohasama town, Hanamaki city, Iwate prefecture
Coherent formation
Paleozoic volcanic island arc
early - middle Permian (Fusulinids)
Correlation: Sotokawame Formation?, Sakamotozawa Formation, Kanokura Formation

Lithofacies: Mudstone, Interbedded sandstone and mudstone, Sandstone
Lithofacies (Minor): Conglomerate (Usuginu type)
Sedimentary structures: Parallel stratification, Graded bedding

Thickness: 1,100 m or thicker

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: Kurosawa creek - Komata river, Take river (Hienuki river), Ohasama town, Hanamaki city, Iwate pref.; Sahinai, Shiwa city, Shiwa county, Iwate pref.
Fossils: Mollusks, Crinoids, Corals, Trace fossils
Fossils (Brachiopods): Derbyia magnifica, Martinia cf. rostrata, Spiriferina cristata
Fossils (Limestone gravels): Crinoids, Green algae, Microfossils (Tublphytes sp.)
Fossils (Limestone gravels, Fusulinids): Chalaroschwagerina cf. vulgaris, Codonofustella sp., Nankinella sp., Pseudofusulina fusiformis

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.)