Oritsuki Member

[ Top ] [ Japanese ]

Oritsuki Member Matsuda, 1961

Type locality: Togurigawa river, Oritsuki, Nanbu city, Minamikoma county, Yamanashi prefecture
Coherent formation
Trough basin-fill deposit at the collision boundary between Izu-Bonin-Mariana arc and Southwest - East Japan island arc
Back-arc basin volcanic activity at the back-arc basin of Izu-Bonin-Mariana arc
late Miocene

Sedimentary facies: Marine
Lithofacies: Sandstone-dominant interbedded sandstone and mudstone
Lithofacies (Minor): Conglomerate
Sedimentary structures: Sole marks
Paleocurrent: North-northeast

Thickness: ca. 640 m
Upper limit: Transitional (Tsukiyo Member)

Shizuoka Formation
[ Upper ]
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Tsukiyo Member
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Oritsuki Member
?--?--?--?--?-
Kaibushi Member
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[ Lower ]

Fujikawa Group (Western zone)
[ Upper ]
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Shizuoka Formation
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[ Lower ]

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

Distribution: Togurigawa river, Oritsuki, Nanbu city, Minamikoma county, Yamanashi pref.

Sugiyama and Matsuda (2014) Geology of the Nanbu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 134p. (in Japanese with English abstract 5p.)