Teradani Formation

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Teradani Formation Kobayashi et al., 1955

Type locality: Tera valley, Daira, Asahi city, Shimoniikawa county, Toyama prefecture
Coherent formation
Early Jurassic, Pliensbachian (Ammonoids)

Sedimentary facies: Marine
Lithofacies: Mudstone
Lithofacies (Lower, Minor): Conglomerate
Sedimentary structures: Cross stratification, Parallel stratification, Bioturbation

Thickness: ca. 500 m
Upper limit: Conformity (Bottom of the sandstone bed)
Upper limit: Conformity (Shinatani Formation)
Lower limit: Conformity (Negoya Formation)

Kuruma Group (Mount Inugatake, Toyama pref.)
[ Upper ]
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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
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[ Lower ]

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

Distribution: Tera valley - Kitatani valley, Daira, Asahi city, Shimoniikawa county, Toyama pref.; Mount Kikuishiyama, Asahi city, Shimoniikawa county, Toyama pref. - Itoigawa city, Niigata pref.; Mount Shiratoriyama, Itoigawa city, Niigata pref.
Fossils (Ammonoids): Amaltheus sp., Canavaria sp.

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