Yabe Formation

[ Top ] [ Japanese ]

Yabe Formation (Minashi and Yazaki, 1968) Eto et al., 1998

Invalid synonym: Yabe Group, Sakanodai Formation

Type locality: Kinugasayama park, Kinugasa town, Yokosuka city, Kanagawa prefecture
Accretionary complex
Miocene
Correlation: Kojima Formation

Sedimentary facies: Marine
Lithofacies (Upper): Interbedded tuffaceous sandstone and mudstone, Mudstone
Lithofacies (Lower): Tuffaceous sandstone, Dacite tuff

Thickness: 650 - 700 m or thicker
Upper limit: Unconformity (Miura Group)
Lower limit: Fault (Kinugasa Formation)

Yabe Formation
[ Upper ]
--------------
Koyabe Tuffaceous Sandstone and Mudstone Member
--------------
Sakaguchi Tuffaceous Sandstone Member
::::::::::::::
[ Lower ]

Hayama Group
[ Upper ]
~~~~~~~~~~~~~~
Yabe Formation
::::::::::::::
Kinugasa Formation
/--/--/--/--/-
Oyama Formation
--------------
Abuzuru Formation
--------------
Morito Formation
?--?--?--?--?-
[ Lower ]

Mineoka Belt (Miura peninsula)
[ Upper ]
~~~~~~~~~~~~~~
Miura Group
~~~~~~~~~~~~~~
Hayama Group
?--?--?--?--?-
[ Lower ]

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

Distribution: Kinugasa town - Koyabe - Morisaki - Hirasaku - Sahara - Kumura, Yokosuka city, Kanagawa pref.

Takahashi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.8, pp.375-395, DOI
Eto et al. (1998) Geology of the Yokosuka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 128p. (in Japanese with English abstract 3p.)