Wake Formation

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Wake Formation Sato et al., 2016

Type locality (Upper): Mount Konoueyama, Wake city, Wake county, Okayama prefecture
Type locality (Lower): Yakiyama - Shizudani school, Bizen city, Okayama prefecture
Volcanic rocks
Late Cretaceous (ca. 82 - 81 Ma, FT)
Intruded by: Myokenzan Granodiorite, Andesite dikes, Rhyolite - Dacite stocks

Sedimentary facies: Terrestrial
Sedimentary facies (Minor): Lacustrine
Sedimentary facies: Caldera-fill deposit
Lithofacies: Pyroclastic flow deposits
Lithofacies: Rhyolite - Dacite pyroclastic rocks, Lava
Lithofacies (Minor): Clastic rocks

Thickness: 2,500 m or thicker
Lower limit: Unconformity (Mantomi Unit, Ejiri Unit, Goishigawa Unit, Hinase Formation, Dodozan Formation, Nibori Granite)

Wake Formation
[ Upper ]
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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
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[ Lower ]

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

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

Distribution: Mount Konoueyama, Wake city, Wake county, Okayama pref.; Yakiyama - Shizudani school, Bizen 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.)
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.)