Momonoki Subgroup

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Momonoki Subgroup Kosaka and Tsunoda, 1969

Invalid synonym: Momonoki Formation

Coherent formation
Miocene (16 - 13 Ma)

Sedimentary facies: Marine
Sedimentary facies: Terrigenous sediments
Depth of water: Deep sea
Lithofacies (Upper): Conglomerate
Lithofacies (Lower): Mudstone, Interbedded sandstone and mudstone
Lithofacies (Lower, Minor): Andesite volcaniclastic rocks, Lava

Thickness: 1,300 m or thicker
Upper limit: Unconformity (Ojirogawa Mudflow Deposit, Kyoraishi Formation)
Lower limit: Conformity, partly unconformity (Kushigatayama Subgroup)

Western part
[ Upper ]
~~~~~~~~~~~~~~
Oharano Formation
--------------
[ Lower ]

Eastern part
[ Upper ]
~~~~~~~~~~~~~~
Mogura Formation
~~~~~~~~~~~~~~
[ Lower ]

Koma Group
[ Upper ]
~~~~~~~~~~~~~~
Momonoki Subgroup
-------~~~~~~~
Kushigatayama Subgroup
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: western Koma mountains, 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.)
Kawachi (1977) Geology of the Yatsugatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 92p. (in Japanese with English abstract 4p.)