Nishimizuguchi Formation

Nishimizuguchi Formation Shikano et al., 2011

Type locality: Nomura seashore - Kitaura seashore, Nomura river, Nishimizuguchi - Nomura, Oga city, Akita prefecture
Type locality (Sub): Aikawa river, Aikawa - Shimoshinzan, Oga city, Akita prefecture
Coherent formation
Pliocene, Placenzian - Pleistocene, Gelasian (3.6 - 1.8 Ma)

Lithofacies: Mudstone Siltstone
Lithofacies (Minor): Tuffaceous sandstone

Thickness: 440 m
Upper limit: Bottom of Ak3
Upper limit: Transitional (Kitaura Formation)
Lower limit: Top of Minamihirasawa Tuff
Lower limit: Conformity (Minamihirasawa Formation)

Oga peninsula, Akita pref.
[ Upper ]
~~~~~~~~~~~~~~
Shibikawa Formation
--------------
Wakimoto Formation
--------------
Kitaura Formation
--------------
Nishimizuguchi Formation
--------------
Minamihirasawa Formation
--------------
Funakawa Formation
--------------
[ Lower ]

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

Distribution: Nomura seashore - Kitaura seashore, Nomura river, Nishimizuguchi - Nomura, Oga city, Akita pref.; Aikawa river, Aikawa - Shimoshinzan, Oga city, Akita pref.
Fossils: Sponges (Makiyama chitanii), Radiolarians, Calcareous nannofossils, Diatoms
Fossils (Foraminifera): Bolivinita quadrilatera, Eggerella bradyi, Eilohedra rotunda, Epistominella pulchella, Martinottiella communis, Martinottiella nodulosa, Melonis pompilioides, Miliammina echigoensis, Pseudoparrella takayanagii, Pullenia apertura, Valvulineria sadonica
Tephra: Nm3, Nm2, Nm1

Kano et al. (2011) Geology of the Toga and Funakawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)