Honkomatsu Lavas

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Honkomatsu Lavas (Nagai et al., 2006) Oikawa and Ishizuka, 2011

Invalid synonym: Honkomatsu Lava Group

Type locality: Shiraiso seashore, Manazuru city, Ashigarashimo county, Kanagawa prefecture
Volcanic rocks
Middle Pleistocene (ca. 0.18 - 0.17 Ma, Tephra; 0.2 Ma, K-Ar)
Correlation: Shichikunitoge Loam

Sedimentary facies: Terrestrial
Lithofacies: Clinopyroxene orthopyroxene dacite lava, Rhyolite lava

Thickness: 50 m or thicker
Lower limit: Unconformity (Iwa Lavas)

Honkomatsu Lavas
[ Center ]
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Honkomatsu Lava
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Nango Lava
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[ Margin ]

Hakone volcano (Manazuru)
[ Upper ]
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Makuyama Lava
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Manazurumisaki Lava
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Honkomatsu Lava
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Shiraiso Lavas
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Iwa Lavas
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>Uminodaira 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: Shiraiso seashore - Manazuru, Manazuru city, Ashigarashimo county, Kanagawa pref.; Mount Nangosan, Yugawara 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.)