Takazawa Scoria

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Takazawa Scoria Hayatsu, 1985

Type locality: Takazawa, Shinano city, Kamiminochi county, Nagano prefecture
Tephra
Stratovolcano
Pleistocene
Correlation: Oshika Scoria Group

Lithofacies: Andesite, Basalt
Lithofacies (Upper): Scoria, Lapilli, Volcanic ash, Volcanic blocks
Lithofacies (Lower): Scoria, Volcanic ash
Sedimentary structures: Parallel stratificaiton

Source (Basalt): Myoko volcano
Thickness: ca. 15 m or thicker
Lower limit: Unconformity (Takazawa Pyroclastic Flow Deposit)

2nd stage
[ Upper ]
~~~~~~~~~~~~~~
Takazawa Scoria
~~~~~~~~~~~~~~
1559m-ho Lava
~~~~~~~~~~~~~~
Tenguiwa Lava
~~~~~~~~~~~~~~
Nanamagarisaka Lava
~~~~~~~~~~~~~~
Ichirozawa Lava
~~~~~~~~~~~~~~
Hesoyama Lava
~~~~~~~~~~~~~~
[ Lower ]

Kurohime volcano
[ Upper ]
~~~~~~~~~~~~~~
3rd stage
~~~~~~~~~~~~~~
2nd stage
~~~~~~~~~~~~~~
1st stage
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Takazawa, Shinano city, Kamiminochi county, Nagano pref.

Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)