Sagara Group

Coherent formation
middle Miocene - Pliocene

Sedimentary facies: Marine
Sedimentary facies: Forearc basin (Sagara-Kakegawa Basin) deposit
Depth of water: Upper bathyal (200 - 600 m) - Middle bathyal (600 - 1,000 m)
Lithofacies: Interbedded sandstone and mudstone, Mudstone
Lithofacies (Minor): Volcanic ash

Thickness: 1,500 m or thicker
Upper limit: Conformity (Kakegawa Group), Unconformity (Furuya Mud Bed, Kyomatsubara Sand Bed, Makinohara Gravel Bed, Omaezaki Terrace Deposit)
Lower limit: Unconformity (Setogawa Group, Oigawa Group, Megami Formation, Mikasa Group)

Sagara Group (Western part)
[ Upper ]
--------------
Hagima Conglomerate
--------------
Oyori Mudstone
--------------
Hirugaya Alternation
--------------
Sugegaya Alternation
~~~~~~~~~~~~~~
[ Lower ]

Sagara Group (Central part)
[ Upper ]
--------------
Hiki Alternation
--------------
Ogane Mudstone
--------------
Sagara Alternation
--------------
Yokobuna Mudstone
~~~~~~~~~~~~~~
[ Lower ]

Sagara Group (Eastern part)
[ Upper ]
--------------
Omaezaki Alternation
--------------
Sagara Alternation
--------------
Susuki Mudstone
--------------
Jitogata Alternation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Shizuoka pref.
Fossils: Sponges (Sagarites chitanii), Calcareous nannofossils, Foraminifera

Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)
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.)