Hirono Formation

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Hirono Formation

Invalid synonym: Tsuyama Group

Type locality: Hirono, Tsuyama city, Okayama prefecture
Coherent formation
Triassic

Lithofacies: Shale
Lithofacies (Minor): Sandstone, Conglomerate

Lower limit: Unconformity (Aida Formation)

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
~~~~~~~~~~~~~~
[ Lower ]

Hirono Formation
[ Upper ]
--------------
Shimouryubara Alternation Member
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[ Lower ]

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

Distribution: Hirono, Tsuyama city, Okayama pref.

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.)