Uyamasegi Lava

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Uyamasegi Lava

Invalid synonym: Uyamaen Lava

Type locality: Uyama-zeki, Tateshina, Tateshina city, Kitasaku county, Nagano prefecture
Volcanic rocks
early Pleistocene (1.08 Ma, K-Ar)

Lithofacies: Hypersthene augite andesite lava (A flow unit)

Source: West of Mount Tateshina
Eruptive volume: 2.2 km³
Thickness (A unit): 20 - 80 m
Running distance: 10 km
Upper limit: Unconformity (Amazakai Pyroclastic Flow Deposit, Ryugamine Lava)
Lower limit: Unconformity (Enrei Volcanic Rocks)

Nijinotaira Volcanic Rocks
[ Upper ]
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Ryugamine Lavas
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Kyowa-bokujo Lavas
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Uyamasegi Lava
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[ Lower ]

Ryugamine volcanic body
[ Upper ]
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Nijinotaira Volcanic Rocks
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[ Lower ]

Yabashira volcanoes
[ Upper ]
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Kengamine volcanic body
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Byobuiwa volcanic body
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Yabashirayama volcanic body
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Ryugamine volcanic body
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Tokin-no-iwa volcanic body
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[ Lower ]

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

Distribution: 1,050 - 1,450 m above sea level, Omozawa river - Honzawa, Nagawa city, Chiisagawa county, Nagano pref.; Tateshina farm - Uyamasegi - Yaeharasegi, Tateshina city, Kitasaku county, Nagano pref.

Nishiki and Takahashi (2012) Jour. Geol. Soc. Japan, vol.118, no.8, pp.499-515 DOI
Kawachi and Aramaki (1979) Geology of the Komoro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 2p.)
Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)