Kitamatadani Formation

Kitamatadani Formation Sato and Hayami, 1956

Type locality: Kitamata valley, Asahi city, Shimoniikawa county, Toyama prefecture
Coherent formation
Early Jurassic, Pliensbachian (187, 186 Ma, U-Pb)
Correlation: Odokorogawa Formation, Douden Formation

Sedimentary facies: Marine
Lithofacies: Mudstone
Lithofacies (Minor): Sandstone, Conglomerate, Felsic tuff
Sedimentary structures: Up-ward fining, Parallel stratification, Cross stratification

Thickness: ca. 1,000 - 1,500 m
Upper limit: Conformity (Bottom of the thick sandstone bed of Aisawadani Member)
Upper limit: Conformity (Negoya Formation)
Lower limit: Conformity (Jogodani Formation)

Kuruma Group (Mount Inugatake, Toyama pref.)
[ Upper ]
~~~~~~~~~~~~~~
Otakidani Formation
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Shinatani Formation
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Teradani Formation
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Negoya Formation
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Kitamatadani Formation
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Jogodani Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Kitamatadani valley - Fukisawadani valley - Jogodani valley - Mount Inugadake, Asahi city, Shimoniikawa county, Toyama pref.; Nishimatazawa creek - Higashimatazawa creek - Osorozawa creek, Itoigawa city, Niigata pref.
Fossils (Shellfishes): Astarte sp., Corbicula sp., Crenotrapezium sp., Eomiodon sp.

Takeuchi et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.5, pp.335-350 DOI
Takeuchi et al. (2017) Geology of the Tomari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 121p. (in Japanese with English abstract 4p.)
Takeuchi et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.7, pp.193-216, DOI
Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)