Tamayama Formation

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Tamayama Formation (Konno, 1938) Sukai, 1957

Type locality: Tamayama, Yotsukura town, Iwaki city, Fukushima prefecture
Coherent formation
southern Yezo Forearc basin (Jobanoki basin)
Late Cretaceous, late Coniacian - Santonian

Sedimentary facies: Marine, Fluvial
Sedimentary facies: Alluvial plain, Continental shelf
Sedimentary facies: Braided river, Shoreface - Inner shelf
Lithofacies: Sandstone
Lithofacies (Minor): Conglomerate

Thickness: 60 - 280 m
Upper limit: Unconformity (Shiramizu Group)
Lower limit: Bottom of the very thick sandy siltstone-deficient sandstone bed
Lower limit: Unconformity (Kasamatsu Formation)

Tamayama Formation
[ Upper ]
~~~~~~~~~~~~~~
Irimazawa Member
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Kohisagawa Member
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[ Lower ]

Futaba Group
[ Upper ]
~~~~~~~~~~~~~~
Tamayama Formation
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Kasamatsu Formation
--------------
Ashizawa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Tamayama, Yotsukura town, Iwaki city, Fukushima pref.; Itagizawa - Dogihara, Ohisa village, Iwaki city, Fukushima pref.; Kitazawa - Ohisa river - Doshimo, Hirono city, Futaba county, Fukushima pref.

Ando et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.49-67 DOI
Kubo et al. (2002) Geology of the Kawamae and Ide District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 136p. (in Japanese with English abstract 6p.)
Iwao and Matsui (1961) Taira and Kawamae, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 17p.)