Yugawara volcano

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Yugawara volcano

Volcanic rocks
Middle Pleistocene (ca. 0.4 - 0.25 Ma, K-Ar)
Intruded by: Shinzakigawa Rhyolite

Sedimentary facies: Terrestrial
Lithofacies: Olivine augite basalt - andesite, Olivine orthopyroxene clinopyroxene basalt - andesite, Orthopyroxene clinopyroxene andesite, Clinopyroxene orthopyroxene dacite, Hornblende orthopyroxene dacite, Quartz clinopyroxene orthopyroxene rhyolite lava, Pyroclastic rocks

Upper limit: Unconformity (Uminodaira Lavas, Kajiya Rhyolite, Higaneyama Rhyolite)
Lower limit: Unconformity (Atami volcano, Izusan Dacite)

Yugawara volcano
[ Upper ]
+__+__+__+__+_
Shiroyama Lavas
~~~~~~~~~~~~~~
Fudotaki Lavas
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[ Lower ]

Hakone volcanoes
[ Upper ]
+__+__+__+__+_
Hakone volcano
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Yugawara volcano
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[ Lower ]

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

Distribution: Yugawara - Fujiki river, Yugawara city, Ashigarashimo county, Kanagawa pref.; Mount Kurakakeyama, Hakone city, Ashigarashimo county, Kanagawa pref.

Oikawa and Ishizuka (2011) Geology of the Atami District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 61p. (in Japanese with English abstract 3p.)