Hododaira Formation

[ Top ] [ Japanese ]

Hododaira Formation Ikebe, 1940

Type locality: Kunizawa river, Oguni city, Nagaoka city, Niigata prefecture
Coherent formation
Submarine fan
early Pliocene
Correlation: lower Nishiyama Formation, middle - lower Tamugigawa Formation

Depth of water: Bathyal
Lithofacies: Turbidite
Lithofacies: Mudstone-dominant interbedded sandstone and mudstone
Sedimentary structures (Minor): Slump structures

Thickness: ca. 200 - 400 m
Upper limit: Bottom of Haa-I Tephra
Upper limit: Conformity (Hachikokusan Formation)

Hachikokusan region, Niigata pref.
[ Upper ]
--------------
Hachioji Formation
--------------
Suganuma Formation
--------------
Hachikokusan Formation
--------------
Hododaira Formation
--------------
[ Lower ]

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

Distribution: Kunizawa river, Oguni city, Nagaoka city, Niigata pref.; Kunoki pass - Takeishi pass - Kanakura shrine, Kashiwazaki city - Nagaoka city, Niigata pref.
Tephra: Ya

Kobayashi et al. (1995) Geology of the Kashiwazaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 102p. (in Japanese with English abstract 4p.)
Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)