Habu Tuff Member

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Habu Tuff Member Itsukaichi Basin Research Group, 1981

Type locality: Hirai river, Habu, Akiruno city, Tokyo
Volcanic rocks
middle Miocene

Lithofacies: Felsic tuff
Lithofacies (Minor): Mudstone, Sandstone

Thickness: 150 m
Upper limit: Conformity (Tateya Mudstone Member)
Lower limit: Conformity (Kosho Mudstone Member)

Akikawa Formation
[ Upper ]
~~~~~~~~~~~~~~
Yokosawa Sandstone and Mudstone Member
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Ina Sandstone Member
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Takao Tuff Member
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Tateya Mudstone Member
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Habu Tuff Member
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Kosho Mudstone Member
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Sajikami Conglomerate Member
~~~~~~~~~~~~~~
[ Lower ]

Itsukaichimachi Group
[ Upper ]
~~~~~~~~~~~~~~
Ajiro Formation
~~~~~~~~~~~~~~
Akikawa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Hirai river, Habu, Akiruno city, Tokyo; Ochiai - Bodaira - Tamanouchi, Hinode town, Nishitama county, Tokyo
Fossils (Shellfishes): Acila eximia
Fossils (Foraminifera): Cyclammina cf. incisa, Cyclammina pusilla, Haplophragmoides sp.

Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)
Sakai (1987) Geology of the Itsukaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 5p.)