Nakuidake Volcanic Rock Member

Nakuidake Volcanic Rock Member (Chinzei, 1958) Tuzino et al., 2018

Invalid synonym: Nakuidake Andesite and Pyroclastic Rock Member, Shobusawa Agglomerate, Nauidake Andesite Member

Type locality: Summit of Mount Nakui, Sannohe city, Sannohe county, Aomori prefecture
Coherent formation
middle Miocene (14.7, 14.3 Ma, K-Ar)

Sedimentary facies: Shallow marine
Lithofacies: Basaltic andesite, Dacite
Lithofacies: Lava, Hyaloclastite, Tuff breccia, Lapilli tuff
Lithofacies (Minor): Tuffaceous sandstone

Thickness: ca. 80 m
Upper limit: Unconformity (Towada-Ofudo Pyroclastic Flow Deposit)

Suenomatuyama Formation
[ Upper ]
~~~~~~~~~~~~~~
Mainosawa Sandstone Member
--------------
Aikawa Volcanic Rock Member / Nakuidake Volcanic Rock Member
--------------
Itukamati Sandstone Member
--------------
Anausi Conglomerate Member
--------------
[ Lower ]

Shiratorigawa Group
[ Upper ]
~~~~~~~~~~~~~~
Suenomatuyama Formation
--------------
Kadonosawa Formation
--------------
Yotsuyaku Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Mount Nakui, Sannohe city, Sannohe county, Aomori pref.; Kintaichi, Ninohe city, Iwate pref.

Tuzino et al. (2018) Geology of the Ichinohe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 161p. (in Japanese with English abstract 4p.)