Shimotomai Volcaniclastic Rock Member

Shimotomai Volcaniclastic Rock Member (Chinzei, 1958) Tuzino et al., 2018

Invalid synonym: Shimotomai Pyroclastics, Shimotomai Agglomerate

Type locality: Jumonji river, Shimotomai, Ninohe city, Iwate prefecture
Type locality (Previous): Shimotomai, Ninohe city, Iwate prefecture
Coherent formation
middle Miocene

Sedimentary facies: Shallow marine
Sedimentary facies: Reworked deposits of Aikawa Volcanic Rock Member
Lithofacies: Basaltic andesite - Andesitic tuff breccia, Lapilli tuff, Volcanic breccia, Lava, Gravel-bearing sandstone
Sedimentary structures: Slump structures

Thickness: 0 - 50 m

Zyumonzi Formation
[ Upper ]
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Shimotomai Volcaniclastic Rock Member
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Metoki Coquina Conglomerate Member
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Hinosawa Conglomerate Member
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[ Lower ]

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

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

Distribution: Shimotomai - Bonno, 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.)