Kunawa Sandstone Member

[ Top ] [ Japanese ]

Kunawa Sandstone Member Nakajima and Watanabe, 2005

Type locality: Arakidani - Kunawa, Futtsu city, Chiba prefecture
Coherent formation
Pliocene

Sedimentary facies: Marine
Lithofacies: Sandy mudstone, Muddy sandstone, Sandstone
Lithofacies (Minor): Tuff

Thickness: 6 - 103 m
Upper limit: Kurotaki Unconformity (Kurotaki Formation)
Lower limit: Bottom of An158

Anno Formation
[ Upper ]
~~~~~~~~~~~~~~
Kunawa Sandstone Member
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Sak slump
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Amg slump
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Tkw slump
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Tak slump
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[ Lower ]

Awa Group (Western part)
[ Upper ]
~~~~~~~~~~~~~~
Anno Formation
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Kiyosumi Formation
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Amatsu Formation
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Kinone Formation
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Sakuma Formation
~~~~~~~~~~~~~~
[ Lower ]

Awa Group (Eastern part)
[ Upper ]
~~~~~~~~~~~~~~
Anno Formation
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Kiyosumi Formation
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Amatsu Formation
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Kinone Formation
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Kanigawa Formation
?--?--?--?--?-
Fukawa Formation
~~~~~~~~~~~~~~
[ Lower ]

Mineoka Belt (Boso peninsula)
[ Upper ]
~~~~~~~~~~~~~~
Awa Group / Minamiboso Group
~~~~~~~~~~~~~~
Hota Group
::::::::::::::
Mineoka Group
?--?--?--?--?-
[ Lower ]

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

Distribution: Arakidani - Kunawa - Seki - Hagiu, Futtsu city, Chiba pref.
Fossils: Shellfishes
Tephra: An158

Kameo and Sekine (2013) Jour. Geol. Soc. Japan, vol.119, no.6, pp.410-420 DOI
Nakajima and Watanabe (2005) Geology of the Futtsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 102p. (in Japanese with English abstract 8p.)