Daiyama Welded Lapilli Tuff Member

Daiyama Welded Lapilli Tuff Member (Mitsuno and Omori, 1984) Sato et al., 2022

Invalid synonym: Daiyama Formation, Daiyama Rhyolite Member, Tsuchihashi Shale Member

Type locality: Mount Mitsuishishiroyama, Bizen city, Okayama prefecture
Volcanic rocks
Late Cretaceous (82.4, 80.7 Ma, U-Pb)

Sedimentary facies: Terrestrial
Lithofacies: Welded lapilli tuff, Tuff
Lithofacies (Minor): Mudstone, Tuffaceous sandstone

Thickness: ca. 200 - 380 m
Upper limit: Conformity (Nodani Tuff Member, Hirayamadani Welded Tuff Member)
Lower limit: Unconformity (Goishigawa Unit, Hinase Formation)

Wake Formation
[ Upper ]
~~~~~~~~~~~~~~
Kumayama Welded Lapilli Tuff Member
'''''''/,,,,,,,
Wakefuji Rhyolite Member
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Fujino Tuff Member
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Yoshinaga Welded Lapilli Tuff Member
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Myojinyama Welded Lapilli Tuff Member
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Yagitani Welded Tuff Member
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Hirayamadani Welded Tuff Member
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Nodani Tuff Member
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Daiyama Welded Lapilli Tuff Member
~~~~~~~~~~~~~~
[ Lower ]

Wake caldera
[ Inner ]
~~~~~~~~~~~~~~
Wake Formation
~~~~~~~~~~~~~~
Hinase Formation
~~~~~~~~~~~~~~
[ Outer ]

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

Distribution: Mount Mitsuishishiroyama - Nodani - Yakiyama - Yoshinaga town - Konehon - Kidani - Inbe, Bizen city, Okayama pref.
Deposit: Pyrophyllite

Sato et al. (2022) Geology of the Wake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 106p. (in Japanese with English abstract 4p.)
Sato et al. (2016) Geology of the Banshu-Ako District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 68p. (in Japanese with English abstract 3p.)