Shimoyama Alternation Member

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Shimoyama Alternation Member

Coherent formation
Triassic, Norian

Lithofacies (Upper): Shale
Lithofacies (Lower): Interbedded sandstone and shale

Thickness: 125 m or thicker
Thickness (Lower): 25 m
Lower limit: Unconformity (Kusakabe Clayslate Member)

Hirono Formation
[ Upper ]
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Shimoyama Alternation Member
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Fukui Alternation Member
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Doi Coal-bearing Member
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[ Lower ]

Hirono Formation
[ Upper ]
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Shimouryubara Alternation Member
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[ Lower ]

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

Distribution: Natsume - Kitayama, Tsuyama city, Okayama pref.
Fossils (Shellfishes): Cardium? sp., Entomonotis kurosawai, Entomonotis ochotica, Entomonotis var. cfr. densistriota, Entomonotis ochotica var. eushachis
Fossils (Plants): Neocalamites sp., Podozamites sp.

Kawai (1957) Tsuyama-Tobu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 63p. (in Japanese with English abstract 8p.)