Kumayama Welded Lapilli Tuff Member

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

Invalid synonym: Kumayama Formation

Type locality: Mount Kumayama, Akaiwa city, Okayama prefecture
Volcanic rocks
Late Cretaceous

Sedimentary facies: Terrestrial
Lithofacies: Hornblende biotite rhyolite welded lapilli tuff
Lithofacies (Minor): Mudstone

Thickness: ca. 200 m or thicker
Upper limit: Conformity (Fujino Tuff Member)
Lower limit: Interfingered (Wakefuji Rhyholite Member)

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 Kumayama - Mount Funaoroshiyama, Akaiwa city, Okayama pref.

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.)