Hiraide Sand and Gravel Member

[ Top ] [ Japanese ]

Hiraide Sand and Gravel Member Toyono Collaborative Research Group, 1977

Type locality: Shirasaka pass, Toyono, Nagano city, Nagano prefecture
Coherent formation
Middle Pleistocene

Sedimentary facies: Lacustrine
Lithofacies: Sands, Gravels, Clay
Lithofacies (Top, Minor): Volcanic ash, Peat-bearing silt

Thickness: ca. 20 m
Upper limit: Unconformity (Hokushin Loam)
Lower limit: Conformity (Kannonyama Silt Member)

Toyono Formation
[ Upper ]
~~~~~~~~~~~~~~
Hiraide Sand and Gravel Member
--------------
Kannonyama Silt Member
--------------
Takaoka Sand and Silt Member
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Shirasaka pass - Hiraide - Kose - Mukaihara, Toyono, Nagano city, Nagano pref.

Akahane et al. (1992) Geology of the Nakano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 106p. (in Japanese with English abstract 4p.)