Himaka Formation

Himaka Formation Nakamura, 1926

Type locality: Himakajima island, Minamichita city, Chita county, Aichi prefecture
Coherent formation
Miocene

Sedimentary facies: Marine
Lithofacies (Upper): Interbedded sandstone and siltstone
Lithofacies (Upper, Minor): Tuff
Lithofacies (Lower): Sandstone
Sedimentary structures (Upper): Load cast, Slump structures

Thickness: ca. 10 - 200 m or thicker
Upper limit: Bottom of Hasu Tuffaceous Sandstone
Upper limit: Conformity (Toyohama Formation)
Lower limit: Unconformity?

Morozaki Group
[ Upper ]
~~~~~~~~~~~~~~
Utsumi Formation
--------------
Yamami Formation
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Toyohama Formation
--------------
Himaka Formation
~~~~~~~~~~~~~~
[ Lower ]

First Setouchi Supergroup (Aichi pref.)
[ Upper ]
~~~~~~~~~~~~~~
Morozaki Group
~~~~~~~~~~~~~~
[ Lower ]

[ Upper ]
~~~~~~~~~~~~~~
Second Setouchi Supergroup
?--?--?--?--?-
First Setouchi Supergroup
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Himakajima island - Sakujima island - Cape Hazu - Hayashizaki - Tsubutegaura - Shimose - Nezumijima island, Minamichita city, Chita county, Aichi pref.
Fossils (Shellfishes): Acharax tokunagai, Acila cfr. divaricata, Acilana tokunagai, Buccinum sp., Cyclocardia siogamensis, Fissidentalium cfr. yokoyamai, Ginebis cfr. osawanoensis, Laevidentalium sp., Liocyma minuta, Lucinoma acutilineatum, Macoma izurensis, Macoma optiva, , Malletia inermis, Megayoldia thraciaeformis, Portlandia cfr. watasei, Ringuhdrillia oyamae, Tectonatica ichishiana, Turritella sp.,

Muramiya et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.11, pp.939-952 DOI
Kondo and Kimura (1987) Geology of the Morozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)