Omaezaki Alternation

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Omaezaki Alternation Mizuno et al., 1987

Type locality: Cape Omaezaki, Omaezaki city, Shizuoka prefecture
Coherent formation
middle Miocene - Pliocene

Sedimentary facies: Marine
Sedimentary facies: Forearc basin (Sagara-Kakegawa Basin) deposit
Lithofacies: Interbedded sandstone and mudstone
Lithofacies (Minor): Siltstone
Sedimentary structures: Slump structures

Thickness: 200 m or thicker
Lower limit: Conformity (Sagara Alternation)

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

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

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

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

Distribution: Cape Omaezaki - Araya, Omaezaki city, Shizuoka pref.
Fossils: Sponges (Sagarites chitanii), Calcareous nannofossils, Foraminifera

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.)