Aimata Formation

[ Top ] [ Japanese ]

Aimata Formation (Matsuda, 1961) Ozaki and Sugiyama, 2018

Invalid synonym: Natsuaki Member, Iitomi Formation

Type locality: Mount Takatori - Mount Minobu - Mount Awakura - Hayakawa bridge, Minobu city, Minamikoma county, Yamanashi prefecture
Volcanic rocks
late Miocene
Contemporaneous heterotopic facies: Minobu Formation
Intruded by: Aimata Intrusive Rocks

Sedimentary facies: Marine
Depth of water: Middle - Lower bathyal
Lithofacies:

Thickness: ca. 250 - 3,750 m
Upper limit: Unconformity (Akebono Formation)
Lower limit: Unconformity (Hara Formation, Kuonji Formation)

Aimata Formation (North)
[ Upper ]
--------------
Karasumoriyama Volcaniclastic Rocks Member
--------------
Takatori Volcaniclastic Rocks, Sandstone and Mudstone Member
--------------
[ Lower ]

Aimata Formation (South)
[ Upper ]
--------------
Shinoisan Member
--------------
Tokuma Member
--------------
[ Lower ]

Fujikawa Group (Central zone)
[ Upper ]
--------------
Hamaishidake Formation / Akebono Formation
--------------
Aimata Formation
--------------
Kuonji Formation
--------------
Hara Formation
--------------
[ Lower ]

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

Distribution: Mount Takatori - Mount Minobu - Mount Awakura - Hayakawa bridge, 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.)