Yoshikura Mudstone Member

[ Top ] [ Japanese ]

Yoshikura Mudstone Member

Coherent formation
middle - late Miocene

Lithofacies (Upper): Siltstone
Lithofacies (Upper, Minor): Sandy mudstone
Lithofacies (Lower): Sandy mudstone
Lithofacies (Lower, Minor): Sandstone

Thickness: ca. 100 - 200 m
Thickness (Upper): one hundred and several dozen m
Thickness (Lower): ca. 50 m
Lower limit: Conformity (Fuchigaya Tuff)

Otogawa Formation (Tsubata, Ishikawa pref.)
[ Upper ]
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Tomonobori Sandy Siltstone Member
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Shimonaka Sandstone Member
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Yoshikura Mudstone Member
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Iwaodaki Tuffaceous Sandstone Member
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[ Lower ]

Tonami Group
[ Upper ]
~~~~~~~~~~~~~~
Mita Formation
~~~~~~~~~~~~~~
Otogawa Formation
~~~~~~~~~~~~~~
Tenguyama Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Shimoyata, Tsubata city, Kahoku county, Ishikawa pref.; Tada, Kahoku city, Ishikawa pref.
Fossils: Echinoids, Sponges (Makiyama sp.)
Fossils (Shellfishes): Limopsis tokaiensis, Lucinoma acutilinealum, Nucula sp.
Tephra Ot2, OT3

Sumi (1978) Geology of the Tsubata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 4p.)
Inoue et al. (1964) Johana, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 5p.)