Younger Haruna Volcanic Fan Deposit

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Younger Haruna Volcanic Fan Deposit

Type locality: Harunashirakawa river, Misato town, Takasaki city, Gunma prefecture
Volcanic rocks
late Pleistocene - Holocene (50 ka - 6th century)
Contemporaneous heterotopic facies: Soja Formation = Motosoja Lahar Deposit
Interfingered: River deposit of Tonegawa river and Karasugawa river

Sedimentary facies: Terrestrial
Sedimentary facies: Debris flow deposit, River deposit
Lithofacies: Sands, Gravels
Lithofacies (Minor): Sands, Silt

Thickness: ca. 40 - 70 m
Upper limit: Unconformity (Jinba Debris Avalanche Deposit)
Lower limit: Unconformity (Jinba Debris Avalanche Deposit)

Younger Haruna Volcanic Fan Deposit
[ Upper ]
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Jinba Debris Avalanche Deposit
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[ Lower ]

Younger Haruna volcano
[ Upper ]
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Futatsudake Lava
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Hr-FP Tephra
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Hr-FA Tephra
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Younger Haruna Volcanic Fan Deposit
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Mizusawayama Lava / Mizusawayama Pyroclastic Flow Deposit and Talus Deposit
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Somayama Lava
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Jagatake Lava
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Harunafuji Lava
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Hr-HP Tephra
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[ Lower ]

Haruna volcano
[ Upper ]
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Younger Haruna volcano
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Older Haruna volcano
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[ Lower ]

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

Distribution: Somagahara, Misato town, Takasaki city - Shinto city, Kitagunma county, Gunma pref.; Shibukawa city, 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.)