Hikimi Group

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Hikimi Group Murakami, 1974

Type locality: Shimane prefecture
Volcanic rocks
Late Cretaceous (88 - 86 Ma)
Intruded in: Hiroshima Granites

Sedimentary facies: Tholeiite
Lithofacies: Pyroclastic flow deposits
Lithofacies (Lower): Dacite welded tuff
Lithofacies (Bottom): Rhyolite welded tuff

Thickness: 500 - 1,000 m
Lower limit: Unconformity (Nishki Group, Yoshiwa Group)

Mochigase stage volcanic rocks
?--?--?--?--?-
Hikimi Group
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Abu Group
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Ochi Group
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Yakumo Volcanic Rocks
?--?--?--?--?-

Sanin Belt
[ Young ]
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Tamagawa stage volcanic rocks
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Younger Inbi stage intrusive rocks
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Older Inbi stage intrusiv rocks
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Inbi stage volcanic rocks
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Mochigase stage intrusive rocks
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Mochigase stage volcanic rocks
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[ Old ]

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

Distribution: Hikimi town - Shiso - Mount Daijingataki - Mikazura, Masuda city, Shimane pref.; Tsuwano city, Kanoashi county, Shimane pref.; Kakinoki - Kawazu, Yoshika city, Kanoashi county, Shimane pref.; Oasa, Kitahiroshima city, Yamagata county, Hiroshima pref.; Yamaguchi pref.

Yoshida et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.12, pp.643-657 DOI
Takahashi et al. (1989) Geology of the Tsuda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 56p. (in Japanese with English abstract 4p.)