Miyazawa Pyroclastic Flow Deposit

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Miyazawa Pyroclastic Flow Deposit (Oshima, 1986) Geshi and Takeuchi, 2012

Type locality: Kamimiyazawa - Miyazawa town - Godo town, Takasaki city, Gunma prefecture
Volcanic rocks
middle Pleistocene (0.24 Ma)
Correlation: Hr-MZ Tephra, Haruna-Fujimi Pumice

Sedimentary facies: Terrestrial
Lithofacies: Calc-alkaline
Lithofacies: Scoria flow deposit (several flow units)

Thickness: 15 - 30 m
Thickness (A unit): 3 - 5 m or thinner

Older Haruna volcanic Fan Deposits
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Miyazawa Pyroclastic Flow Deposit
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Older Haruna volcano
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Miyazawa Pyroclastic Flow Deposit
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Older Haruna Volcanic Products / Older Haruna Volcanic Fan Deposits
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Haruna volcano
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Younger Haruna volcano
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Older Haruna volcano
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------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Kamimiyazawa - Miyazawa town - Godo town, Takasaki city, Gunma pref.; Karasu river, Shimomuroda town - Godo town, Takasaki city, Gunma pref.; Miyukida, Shibukawa city, Gunma pref.; Fujimi pass, Shinto city, Kitagunma county, Gunma pref.

Geshi and Takeuchi (2012) Geology of the Haruna San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)