Kubo Formation

Kamassawa Siltstone and Sandstone Member at the bottom of Kubo Formation was re-defined as the top member of Shitazaki Formation.

Coherent formation
middle Miocene

Lower limit: Bottom of Kamazawa Tuff Member
Lower limit: Conformity (Shitazaki Formation)

Kubo Formation
[ Upper ]
~~~~~~~~~~~~~~
Main part
--------------
Kamazawa Tuff Member
--------------
[ Lower ]

Sannohe Group
[ Upper ]
~~~~~~~~~~~~~~
Kubo Formation
--------------
Shitazaki Formation
--------------
Yanagisawa Formation
--------------
Zyumonzi Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Iwate pref.

Tuzino et al. (2018) Geology of the Ichinohe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 161p. (in Japanese with English abstract 4p.)