4th stage products

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4th stage products Chihara et al., 1977

Type locality: Kassa river, Yuzawa city, Minamiuonuma county, Niigata prefecture
Volcanic rocks
Pleistocene

Lithofacies: Quartz-bearing olivine hypersthene augite andesite lava

Source: Summit of Mount Naeba
Thickness: 150 m or thicker
Lower limit: Unconformity (Tonokawa Formation, 3rd stage products, Gohogi Lake Deposit)

Naeba volcano
[ Upper ]
+__+__+__+__+_
4th stage products
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3rd stage products
~~~~~~~~~~~~~~
2nd stage products
~~~~~~~~~~~~~~
1st stage products
~~~~~~~~~~~~~~
Older Naeba volcanic products
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[ Lower ]

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

Distribution: Kassa river - Mount Kaguragamine - Wadagoya - Harai river - Tonokawa river, Yuzawa city, Minamiuonuma county, Niigata pref.; Mount Hikage, Tsunan city, Nakauonuma county, Niigata pref.

Shimazu and Tateishi (1993) Geology of the Naebasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)
Chihara et al. (1981) Geology of the Echigo-Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 108p. (in Japanese with English abstract 8p.)