Ikobe Gravel Member

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Ikobe Gravel Member (Kuroda, 1958)

Invalid synonym: Takatsuka Gravel

Type locality: Ikobe coast, Toyohashi city, Aichi prefecture
Coherent formation
middle Pleistocene (0.83 Ma, ESR)

Sedimentary facies: Fluvial
Sedimentary facies: Channel-fill deposit
Lithofacies (Upper): Sands, Muddy sands
Lithofacies: Gravels
Lithofacies (Minor): Interbedded gravels and sands, Interbedded gravels and silt
Sedimentary structures: Trough cross-stratification, Paralle stratification
Sedimentary structures (Bottom): Channel structure

Thickness: ca. 3 - 5 m
Upper limit: Transitional (Akasawa Mud Member), Unconformity (Nanane Sandy Mud Member)
Lower limit: Unconformity (Nanane Sandy Mud Member)

Tahara Formation
[ Upper ]
~~~~~~~~~~~~~~
Toshima Sand and Gravel Member
--------------
Kanbe Gravel Member
--------------
Akasawa Mud Member
--------------
Ikobe Gravel Member
~~~~~~~~~~~~~~
[ Lower ]

Atsumi Group
[ Upper ]
~~~~~~~~~~~~~~
Gumihara Formation
~~~~~~~~~~~~~~
Toyohashi Formation
~~~~~~~~~~~~~~
Tahara Formation
~~~~~~~~~~~~~~
Futagawa Formation
?--?--?--?--?-
[ Lower ]

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

Distribution: Ikobe coast - Nishinanane town, Toyohashi city, Aichi pref.; Gumihara, Mutsure town, Tahara city, Aichi pref.
Fossils (Shellfishes): Corbicula sp., Dosinia sp., Mya sp.
Fossils (Upper, Trace fossils): Ophiomorpha isp.

Nakashima et al. (2008) Geology of the Toyohashi and Tahara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 113p. (in Japanese with English abstract 3p.)
Nakashima et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.2, pp.70-79 DOI