Aihara Member

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Aihara Member

Invalid synonym: Shizuki Member

Type locality: Aihara, Sumoto city, Hyogo prefecture
Coherent formation
Pliocene - Pleistocene
Correlation: Asano Member

Sedimentary facies: Fluvial, Lacustrine
Lithofacies: Interbedded silt, clay and sands
Lithofacies (Minor): Gravels, Breccia

Thickness: 100 - 120 m
Upper limit: Conformity (Gunge Member, Tsushi Member)
Lower limit: Conformity (Inohana Member), Unconformity (Granites)

Atago Formation
[ Upper ]
~~~~~~~~~~~~~~
Takedani Member
--------------
Gunge Member / Tsushi Member
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Aihara Member
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Inohana Member
~~~~~~~~~~~~~~
[ Lower ]

Osaka Group (central Awajishima, Hyogo pref.)
[ Upper ]
~~~~~~~~~~~~~~
Goshikihama Formation
--------------
Atago Formation
~~~~~~~~~~~~~~
[ Lower ]

Second Setouchi Supergroup (Osaka pref. - Hyogo pref.)
[ Upper ]
~~~~~~~~~~~~~~
Osaka Group
~~~~~~~~~~~~~~
[ Lower ]

[ Upper ]
~~~~~~~~~~~~~~
Second Setouchi Supergroup
?--?--?--?--?-
First Setouchi Supergroup
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Aihara - Tsushi - Torikai - Kamisakai - Aiga - Nakakawara - Kaminaizen, Sumoto city, Hyogo pref.; Shitoori, Minamiawaji city, Hyogo pref.; Ikuho - Shio, Awaji city, Hyogo pref.
Tephra: Myojin, Oji, Sako, Shitoori

Takahashi et al. (1992) Geology of the Sumoto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 5p.)
Mizuno et al. (1990) Geology of the Akashi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)