Ikuta Formation

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Ikuta Formation (Otsuka, 1932) Oka et al., 1984

Type locality: Ikuta, Tama ward, Kawasaki city, Kanagawa pref.
Coherent formation
Fore-arc basin sediments (Kazusa trough)
Pleistocene
Correlation: Kamihoshikawa Formation

Sedimentary facies: Strong influence by freshwater
Lithofacies: Sandstone-dominant interbedded sandstone and mudstone

Thickness: ca. 5 - 45 m
Upper limit: Conformity (Iimuro Formation)
Lower limit: Conformity (Ozenji Formation, Dedana Formation)

Kazusa Group (central Tama hills)
[ Upper ]
~~~~~~~~~~~~~~
Takatsu Formation
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Iimuro Formation
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Ikuta Formation
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Ozenji Formation
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Kakio Formation
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Tsurukawa Formation
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Tsurukawa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Ikuta - Masugata, Tama ward, Kawasaki city, Kanagawa pref.; Yurigaoka, Asao ward, Kawasaki city, Kanagawa pref.; Utsukushigaoka, Aoba ward, Yokohama city, Kanagawa pref.; Shinyoshida town, Kohoku ward, Yokohama city, Kanagawa pref.
Fossils: Trace fossils
Tephra: Ik

Oka et al. (1984) Geology of the Tokyo-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)