Pyroclastic Rock 5

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Pyroclastic Rock 5

Volcanic rocks
late Miocene

Sedimentary facies (Upper): Pyroclastic fall deposits, Pyroclastic flow deposits
Sedimentary facies (Lower): Pyroclastic flow deposits, Pyroclastic surge deposits
Lithofacies: Tuff, Lapilli tuff
Sedimentary structures (Pyroclastic surge deposit): Cross stratification, Parallel stratification

Host: Kumi Rhyolite, Kamo Rhyolite
Thickness: ca. 10 - 70 m
Thickness (Pyroclastic fall deposit): 3 m or thicker
Thickness (Pyroclastic surge deposit): ca. 10 m
Thickness (Pyroclastic flow deposit): 3 - 20 m or thicker

Middle part
[ Upper ]
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Pyroclastic Rock 6
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Pyroclastic Rock 5
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Pyroclastic Rock 4
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[ Lower ]

Omosu Formation
[ Upper ]
~~~~~~~~~~~~~~
Upper part
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Middle part
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Lower part
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[ Lower ]

Oki-Dogo island, Shimane pref.
[ Upper ]
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Omosu Formation
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Tsuma Formation
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[ Lower ]

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

Distribution: Nishimura - Igo - Mount Soramine - Kumi - Kitakata - Yamada - Mount Koguwakoyama - Imazu - Kishihama - Minoura - Kamo - Kanbi, Okinoshima city, Oki county, Shimane pref.

Yamauchi et al. (2009) Geology of the Saigo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 118p. (in Japanese with English abstract 3p.)