Ogasa Group

Invalid synonym: Ogasayama Gravel

Type locality: Ogasayama hills, Kakegawa city - Fukuroi city, Shizuoka prefecture
Coherent formation
early - middle Pleistocene
Correlation (Upper): Oshika Gravel Bed
Correlation (Lower): Kunozan Gravel Bed

Sedimentary facies: Marine
Sedimentary facies (Minor): Freshwater
Sedimentary facies: Submarine fan delta
Sedimentary facies (Lower): Submarine channel-fill deposit
Lithofacies: Gravels
Lithofacies (Minor): Sands, Silt, Silt (Freshwater)

Thickness: 60 - 400 m or thicker

Ogasa Group
[ Upper ]
--------------
Minamiyama Gravel Bed
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Ogasayama hills, Kakegawa city - Fukuroi city, Shizuoka pref.; Nobe, Iwata city, Shizuoka pref.

Sugiyama and Shimokawa (1990) Geology of the Shimizu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 8p.)
Sugiyama et al. (1988) Geology of the Omaezaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 153p. (in Japanese with English abstract 6p.)
Saito and Isomi (1954) Akihasan, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 34p. (in Japanese with English abstract 10p.)