Kamassawa Sandstone and Siltstone Member

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Kamassawa Sandstone and Siltstone Member (Chinzei, 1958) Chinzei, 1966

Invalid synonym: Kamassawa Alternation of Sandstone and Siltstone Member

This member had been defined as the bottom of Kubo Formation.

Type locality: Kamazawa, Shitazaki, Ninohe city, Iwate prefecture
Coherent formation
late Miocene

Sedimentary facies: Shallow marine
Sedimentary facies: Continental shelf
Lithofacies: Interbedded sandstone, siltstone and tuff

Thickness: 50 m
Upper limit: Bottom of Kamazawa Tuff Member
Upper limit: Conformity (Kamazawa Tuff Member)
Lower limit: Conformity (main part of Shitazaki Formation)

Shitazaki Formation
[ Upper ]
~~~~~~~~~~~~~~
Kamassawa Sandstone and Siltstone Member
--------------
Main part
--------------
Kamimetoki Sandstone Member
--------------
[ Lower ]

Sannohe Group
[ Upper ]
~~~~~~~~~~~~~~
Kubo Formation
--------------
Shitazaki Formation
--------------
Yanagisawa Formation
--------------
Zyumonzi Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Kamazawa, Shitazaki - Shimokaisho, Kintaichi - Joboji, Ninohe city, Iwate pref.; Komukai, Nanbu city, Sannohe county, Aomori pref.
Fossils: Echinoids, Ostracods, Sponges (Spicules), Foraminifera, Diatoms (Thalassionema schraderi)
Fossils (Kubo fauna): Antiplanes sadoensis, Fusitriton oregonensis, Lucinoma acutilineatum, Pandora pulchella, Turritella nipponica, Venericardia ochiaiensis

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.)