N<sub>3</sub> Formation

N₃ Formation

Coherent formation
late Triassic, Carnian

Sedimentary facies: Shallow marine
Lithofacies: Sandy shale, Shale
Lithofacies (Lower): Sandstone, Coal

Thickness: 400 m or thinner
Upper limit: Conformity (N₄ Formation)
Lower limit: Conformity (N₂ Formation)

Nabae Group (Nabae, Fukui pref.)
[ Upper ]
--------------
N₄ Formation
--------------
N₃ Formation
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N₂ Formation
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N₁ Formation
--------------
[ 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.; Matsuoji, Maizuru city, Kyoto pref.; Miuchi - Takatsuki town, Ayabe city, Kyoto pref.
Fossils (Shellfishes): Anodontophora? aff. manmuensis, Bakevellia aff. hekiensis, Bakevellia oyogiensis, Cardinia misawensis, Cardinia triadica, Cardinoides japonicus, Chlamys mojsisovicsi, Cuspidaria ayabensis, Halobia kawadai, Lime naumanni, Lima yataensis, Lima yataensis var. kuredaniensis, Loxonema? sp., Nuculana sp., Ostrea sp., Palaeoneilo sp., Palaeopharus maizurensis, Palaeopharus paucicostatus, Parallelodon monobensis, Pinna aff. lima, Pleuromya aff. foosbergi nipponica, Schafhäutria cf. astartiformis, Spiriferina sp., Tosapecten nabaensis, Tosapecten suzukii, Tosapecten teradensis, Velata maizurensis, Volsella aff. paronaiformis.

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.)