Chikko Formation

Coherent formation
Cretaceous

Sedimentary facies: Marine
Lithofacies: Sandstone
Lithofacies (Minor): Conglomerate

Thickness: ca. 30 m
Upper limit: Angular unconformity (Tonoyama Formation)

Nakaminato Group
[ Upper ]
~~~~~~~~~~~~~~
Isoai Formation
--------------
Hiraiso Formation
?--?--?--?--?-
Chikko Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Nakaminato-Chikko, Hitachinaka city, Ibaraki pref.

Sakamoto et al. (1972) Geology of the Nakaminato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 5p.)