Higashihigasa Formation

[ Top ] [ Japanese ]

Higashihigasa Formation Otsuka and Mochizuki, 1932

Type locality: Seri, Futtsu city, Chiba prefecture
Coherent formation
Fore-arc basin sediments (Kazusa trough)
Fan valley-fill deposit at the upper part of submarine fan in Higashihigasa submarine
Pleistocene
Correlation (Upper): upper Umegase Formation
Correlation (Lower): lower Umegase Formation

Sedimentary facies: Submarine valley opened to east
Lithofacies: Turbidite
Lithofacies: Sandstone
Sedimentary structures: Slump structures, Graded bedding

Thickness: 200 m
Distribution (East - West): ca. 10 km
Distribution (South - North): ca. 1 km

Kazusa Group (western Boso peninsula)
[ Upper ]
~~~~~~~~~~~~~~
Kasamori Formation
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Chonan Formation
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Ichijiku Formation
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Kokumoto Formation
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Umegase Formation
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Higashihigasa Formation
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Otadai Formation
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Kiwada Formation
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Tomiya Formation
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Kurotaki Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Seri - Yokoyama - Yamawaki - Higashiowada, Futtsu city, Chiba pref.; Uehata - Higashihigasa, Kimitsu city, Chiba pref.
Fossils: Mammalia (Parelephas prozimus), Shellfishes

Nakajima and Watanabe (2005) Geology of the Futtsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 102p. (in Japanese with English abstract 8p.)