Kamimetoki Sandstone Member

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Kamimetoki Sandstone Member (Chinzei, 1958) Tuzino et al., 2018

Invalid synonym: Kamimetoki Sandstone and Siltstone Member

This member had been defined as the top part of Tomezaki Formation.

Type locality: Mabechi river, Kamimetoki, Sannohe city, Aomori prefecture
Coherent formation
late Miocene (11.5 - 10.0 Ma, Diatoms)

Sedimentary facies: Shallow marine
Sedimentary facies: Basal conglomerate
Climate: Warm temperate - Intermediate-temperate
Lithofacies: Sandstone, Conglomerate
Lithofacies (Minor): Sandy siltstone, Siltstone, Conglomerate
Sedimentary structures: Cross stratification

Thickness: 10 - 45 m
Upper limit: Conformity (main part of Shitazaki Formation)
Lower limit: Conformity (Zyumonzi Formation), Unconformity (Yanagisawa Formation)

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

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

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

Distribution: Mabechi river, Kamimetoki, Sannohe city, Sannohe county, Aomori pref.; Shiroyama - Sarube river, Sannohe city, Sannohe county, Aomori pref.; Jumonji river, Shimotomai - Bonno - Yanagisawa, Ninohe city, Iwate pref.; Kaisho river, Yachi - Shimokaisho, Ninohe city, Iwate pref.; Nonoue - Shitazaki, Ninohe city, Iwate pref.
Fossils (Younger Shiobara-Yama fauna): Macoma sp., Miyagipecten matsumoriensis, Mizuhopecten paraplebejus
Fossils: Diatoms (Denticulopsis dimorpha)

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.)