Ogane Mudstone

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Ogane Mudstone Mizuno et al., 1987

Invalid synonym: Osagawa Formation

Type locality: Ogane, Omaezaki city, Shizuoka prefecture
Coherent formation
middle Miocene - Pliocene
Correlation: upper - middle Oyori Mudstone

Sedimentary facies: Marine
Sedimentary facies: Forearc basin (Sagara-Kakegawa Basin) deposit
Depth of water: upper part of Middle bathyal (600 - 1,000 m)
Lithofacies: Siltstone
Lithofacies (Minor): Sandstone

Thickness: ca. 100 - 150 m
Upper limit: Conformity (Hiki Alternation)
Lower limit: Conformity (Sagara Alternation)

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

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

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

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

Distribution: Ogane - Nishihara - Genbo - Kassa - Sanma - Higashihara, Omaezaki city, Shizuoka pref.
Fossils: Gastropods, Sponges (Sagarites chitanii), Calcareous nannofossils, Foraminifera
Fossils (Foraminifera): Globorotalia tumida plesiotumida, Globorotalia tumida tumida
Tephra: Sa

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.)