Tochibora Welded Tuff Member

[ Top ] [ Japanese ]

Tochibora Welded Tuff Member

Coherent formation
First Seto Inland Sea
Sedimentary basin in island arc
Miocene (22.4 - 20.2 Ma, K-Ar, FT; 22.4 Ma, U-Pb)

Sedimentary facies: Terrestrial volcano
Lithofacies (Upper): Rhyolitic welded tuff
Lithofacies (Lower): Poorly sorted rhyolitic breccia

Mode of eruption: Phreatomagmatic

Hachiya Formation
[ Upper ]
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6
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5
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4
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3
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Nukabora Pyroclastic Rock Member
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Tochibora Welded Tuff Member
?--?--?--?--?-
[ Lower ]

Kani Group
[ Upper ]
?--?--?--?--?-
Hiramaki Formation
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Nakamura Formation
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Hachiya Formation
?--?--?--?--?-
[ Lower ]

First Setouchi Supergroup (Kani basin, Gifu pref.)
[ Upper ]
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Kani Group
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[ Lower ]

[ Upper ]
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Second Setouchi Supergroup
?--?--?--?--?-
First Setouchi Supergroup
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[ Lower ]

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

Distribution: Kajita - Tochibora, Tomika city, Kamo county, Gifu pref.; Shogenji, Minokamo city, Gifu pref.

Shinjoe et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.7, pp.533-538 DOI
Yoshida and Wakita (1999) Geology of the Gifu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 71p. (in Japanese with English abstract 4p.)