Kinugasa Formation

Kinugasa Formation (Kojima, 1954) Eto et al., 1998

Invalid synonym: Kinugasa Pelitic Olistostrome Formation

Type locality: Ikegami, Yokosuka city, Kanagawa prefecture
Accretionary complex
Olistostrome of Morito Formation
Miocene

Sedimentary facies: Marine, Submarine-landslide deposits
Lithofacies: Broken facies
Lithofacies: Mudstone
Lithofacies (Minor): Interbedded sandstone and mudstone, Ultramafic rocks, Basalt pillow lava

Thickness: 1,800 m
Upper limit: Unconformity (Miura Group), Fault (Sakaguchi Tuffaceous Sandstone Member)
Lower limit: Thrust fault (Oyama Formation)

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: Ikegami - Abekura - Hirasaku - Koyabe - Nobi - Nagasawa - Mount Miurafuji, Yokosuka city, Kanagawa pref.
Fossils (Foraminifera): Spiroloculina? sp.
Fossils (Radiolarians): Calocycletta sp., Cyrtocapsella cornula, Cyrtocapsella tetrapera, Lithopera aff. renzae, Stichocorys delmontensis

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.)