Takezawa Formation

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Takezawa Formation (Tachibana, 1952) Ishizaki, 1968

Invalid synonym: Takezawa Group

Type locality: Takezawa, Higashiyama village, Ichinoseki city, Iwate prefecture
Coherent formation
early Carboniferous, Visean - ? (Fossils)

Sedimentary facies: Marine
Lithofacies: Limestone
Lithofacies (Minor): Pelitic limestone, Calcareous mudstone, Pyroclastic rocks

Thickness: 300 m or thicker
Upper limit: Unconformity
Lower limit: Conformity (Karaumedate Formation)

South Kitakami Belt (Ichinoseki, Iwate pref.)
[ Upper ]
?--?--?--?--?-
Nozuchi Formation
~~~~~~~~~~~~~~
Takezawa Formation
--------------
Karaumedate Formation
--------------
Tobigamori Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Takezawa - Mount Tobigamori - Geibikei valley - Matsukawa, Higashiyama village, Ichinoseki city, Iwate pref.; Kita-Iwairi - Minami-Iwairi, Nagasaka, Higashiyama village, Ichinoseki city, Miyagi pref.
Fossils: Brachiopods, Ostracods, Sponges, Foraminifera
Fossils: Rugosa (Kueichouphyllum sp., Dibunophyllum sp., Diphyphyllum sp.)

Ehiro and Morikiyo (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.47-67 DOI
Takeuchi and Mikoshiba (2002) Geology of the Senmaya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 3p.)