Shimowakago Alternation Member

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Shimowakago Alternation Member

Invalid synonym: Oidani Formation

Coherent formation
Middle - Late Jurassic

Sedimentary facies: Marine
Lithofacies: Interbedded sandstone and shale
Lithofacies (Minor): Conglomerate

Thickness: ca. 300 - 400 m
Lower limit: Conformity (Shimoyama Conglomerate Member)

Arashimadani Formation
[ Upper ]
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Shimowakago Alternation Member
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Shimoyama Conglomerate Member
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[ Lower ]

Kuzuryu Group (Ono, Fukui pref.)
[ Upper ]
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Shimoanama Formation
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Arashimadani Formation
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[ Lower ]

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

Distribution: Misakatoge pass - Shimowakago - Kamiwakago - Misakadani valley - Washi - Asahi, Ono city, Fukui pref.
Fossils: Belemnoids
Fossils (Plants): Cladophlebis denticulata, Cladophlebis cf. exiliformis, Cladophlebis hukuiensis, Equisetites ushimarensis, Onychiopsis elongata, Podozamites griesbachi?, Podozamites lanceclatus, Pseudocycus? acutifolia

Kawai et al. (1957) Arashimadake, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 110p. (in Japanese with English abstract 13p.)