Hokusetsu Subgroup

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Hokusetsu Subgroup

Invalid synonym: Shidara Tertiary Formation

Type locality: Shitara region, Aichi prefecture
Coherent formation
early Miocene (Radiolarians, Paleomagnetic, 19 - 18 Ma, FT)

Sedimentary facies: Marine
Sedimentary facies (Bottom, Minor): Fluvial
Lithofacies: Mudstone, Sandstone, Conglomerate
Lithofacies (Upper, Minor): Tuff, Volcanic lapilli tuff
Lithofacies (Bottom): Conglomerate

Thickness: ? - 700 m or thicker
Upper limit: Unconformity (Nansetsu Subgroup)
Lower limit: Unconformity (Ryoke Belt)

Hokusetsu Subgroup
[ Upper ]
~~~~~~~~~~~~~~
Kadoya Formation
--------------
Ohno Formation
--------------
Kawakado Formation
--------------
Taguchi Formation
~~~~~~~~~~~~~~
[ Lower ]

Shitara Group
[ Upper ]
?--?--?--?--?-
Nansetsu Subgroup (Shitara Volcanic Rocks)
~~~~~~~~~~~~~~
Hokusetsu Subgroup
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Taguchi, Shitara city, Kitashitara county, Aichi pref.; Ebi - Kuroze, Shinjo city, Aichi pref.; Midono river, Toei city, Kitashitara county, Aichi pref.
Fossils (Shellfishes): Acila elongata, Pecten kimurai

Hoshi and Ogawa (2012) Jour. Geol. Soc. Japan, vol.118, no.11, pp.748-761 DOI
Hoshi and Saida (2009) Jour. Geol. Soc. Japan, vol.115, no.5, pp.193-205 DOI
Saito (1955) Mikawa-Ono, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 36p. (in Japanese with English abstract 11p.)