Asou Formation

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Asou Formation Katayama, 1939

Coherent formation
Late Triassic, Carnian - Norian or Rhaetian

Sedimentary facies: Shallow marine
Lithofacies: Sandstone, Mudstone

Thickness: 1,500 m or thicker
Upper limit: Unknown
Lower limit: Conformity (Momonoki Formation)

Mine Group (Omine, Yamaguchi pref.)
[ Upper ]
?--?--?--?--?-
Asou Formation
--------------
Momonoki Formation
~~~~~~~~~~~~~~
Hirabara Formation
~~~~~~~~~~~~~~
[ Lower ]

Mine Group (Asa, Yamaguchi pref.)
[ Upper ]
?--?--?--?--?-
Kamoshiro Formation
--------------
Yamanoi Formation
--------------
Nakatsuka Formation
--------------
Idekami Formation
--------------
Hiramatsu Formation
?--?--?--?--?-
[ Lower ]

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

Distribution: Mine city, Yamaguchi pref.
Fossils: Fishes, Bivalves (Anadontophora sp., Lima sp.), Plants (Nilssonia sp., Equisetites)

Maeda and Oyama (2019) Jour. Geol. Soc. Japan, vol.125, no.8, pp.585-594 DOI