t1 Dacite Tuff

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t1 Dacite Tuff

Tephra
middle Miocene

Sedimentary facies: Submarine pyroclastic flow deposit
Lithofacies: Dacite tuff
Lithofacies (Minor): Shale

Host: Mori Member
Thickness: 20 m or thicker
Upper limit: Conformity (Bessho Formation)

Mori Member
[ Upper ]
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t3 Dacite Tuff
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t2 Dacite Tuff
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t1 Dacite Tuff
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[ Lower ]

Uchimura Formation (Northern part)
[ Upper ]
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Mori Member / Toyosaka Member
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Yokoo Member => Yokoo Formation
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Taroyama Member => Taroyama Formation
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Omineyama Member => Omineyama Formation
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[ Lower ]

Chushin Group
[ Upper ]
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Bessho Formation
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Uchimura Formation
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Moriya Formation
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[ Lower ]

northern Nagano pref.
[ Upper ]
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Hokushin Group
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Chushin Group
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[ Lower ]

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

Distribution: Kagamidai mountain pass - Okiba mountain pass, Mori, Chikuma city, Nagano pref.; Numairi, Sanada town, Ueda city, Nagano pref.

Kato and Akahane (1986) Geology of the Nagano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 120p. (in Japanese with English abstract 5p.)