Marutaki Conglomerate Member

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Marutaki Conglomerate Member (Otsuka, 1955) Matsuda, 1958

Invalid synonym: Shionosawa Member

Type locality: Marutaki, Minobu city, Minamikoma county, Yamanashi prefecture
Coherent formation
Marutaki channel deposit
late Miocene - Pliocene
Contemporaneous heterotopic facies: Yagisawa Mudstone Member
Correlation: Utsubuna Member

Sedimentary facies: Marine
Sedimentary facies: Submarine channel-fill deposit on the continental slope tilted to west-southwest
Sedimentary facies (Upper): Branched submarine channel
Sedimentary facies (Lower): Single submarine channel (3 - 9 km wide, several hundreds - 2,000 m long)
Sedimentary facies (Lower, Minor): Submarine landslide deposit
Lithofacies: Conglomerate
Lithofacies (Minor): Sandstone, Interbedded sandstone and mudstone
Lithofacies (Lower, Minor): Andesite volcaniclastic rocks
Sedimentary structures: Graded bedding, Parallel stratification, Trough cross-stratification, Slump structure

Thickness: ca. 3,500 - 4,000 m
Thickness (Lower, Minor): ca. 20 m
Upper limit: Conformity (Hakii Interbeds of Sandstone and Mudstone Member)

Minobu Formation (North)
[ Upper ]
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Seigo Volcaniclastic Member
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Hakii Interbeds of Sandstone and Mudstone Member
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Marutaki Conglomerate Member
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Yagisawa Mudstone Member
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[ Lower ]

Minobu Formation (Southwest)
[ Upper ]
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Seigo Volcaniclastic Member
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Hakii Interbeds of Sandstone and Mudstone Member
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Marutaki Conglomerate Member
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Omorozawa Member
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[ Lower ]

Fujikawa Group (Eastern zone)
[ Upper ]
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Akebono Formation
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Minobu Formation
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Shimobe Formation
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[ Lower ]

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

Distribution: Marutaki - Obikane - Tsubakizori - Okuzure - Wada - Hinoue, Minobu city, Minamikoma county, Yamanashi pref.

Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)
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.)