N<sub>4</sub> Formation

[ Top ] [ Japanese ]

N₄ Formation

Coherent formation
late Triassic, Carnian

Sedimentary facies: Shallow marine
Lithofacies: Sandstone, Shale

Thickness: 150 - 350 m or thicker
Lower limit: Conformity (N₃ Formation)

Nabae Group (Nabae, Fukui pref.)
[ Upper ]
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N₄ Formation
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N₃ Formation
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N₂ Formation
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N₁ Formation
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[ Lower ]

Central zone (Kyoto - Hyogo)
[ Upper ]
/--/--/--/--/-
Nabae Group
?--?--?--?--?-
Yakuno Group
~~~~~~~~~~~~~~
Maizuru Group
/--/--/--/--/-
[ Lower ]

Maizuru Belt
[ North ]
/--/--/--/--/-
North zone
/--/--/--/--/-
Central zone
/--/--/--/--/-
South zone
/--/--/--/--/-
[ South ]

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

Distribution: Nabae, Takahama city, Oi county, Fukui pref.; Matsuo, Maizuru city, Kyoto pref.

Igi et al. (1961) Maizuru, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 49p. (in Japanese with English abstract 9p.)
Hirokawa et al. (1958) Obama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 31p. (in Japanese with English abstract 8p.)