Akikawa Formation

[ Top ] [ Japanese ]

Akikawa Formation Itsukaichi Basin Research Group, 1981

Coherent formation
middle Miocene

Upper limit: Unconformity (Ajiro Formation, Tomoda Formation, Onita Formation)

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

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

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

Distribution: Itsukaichi, Akiruno city, Tokyo

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.)