Shirifukitoge Pyroclastic Deposit

Shirifukitoge Pyroclastic Deposit Yamamoto and Komazawa, 2004

Invalid synonym: Shirifukitoge Pyroclastics

Type locality: Shirifuki pass, Kaneyama city, Onuma county, Fukushima prefecture
Volcanic rocks
late Pleistocene (110 ka)
Correlation: Numazawa-Shibahara Tephra (Nm-SB)

Sedimentary facies: Rhyolitic pyroclastic surge deposit
Lithofacies: Cummingtonite-bearing hornblende biotite rhyolite tuff
Sedimentary structures: Parallel stratification, Low angle cross-stratification

Thickness: ca. 1.7 m
Lower limit: Unconformity (Takizawagawa Formation, Uwaigusa Formation, Aizu-kaneyama Volcanic Rocks)

Shirifukitoge Pyroclastic Deposit
[ Upper ]
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Unit IV
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Unit III
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Unit II
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Unit I
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[ Lower ]

Numazawa volcano
[ Upper ]
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Numazawako Pyroclastic Deposit / Numazawako Lahar Deposit
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Numagozen Pyroclastic Deposit
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Maeyama Lava
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Sozan Lava
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Mizunuma Pyroclastic Deposit
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Mukurezawa Lava
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Shirifukitoge Pyroclastic Deposit / Nm-SB Tephra
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[ Lower ]

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

Distribution: Shirifuki pass, Kaneyama city, Onuma county, Fukushima pref.

Masubuchi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.10, pp.533-550, DOI
Masubuchi and Ishizaki (2011) Jour. Geol. Soc. Japan, vol.117, no.6, pp.357-376 DOI
Yamamoto and Komazawa (2004) Geology of the Miyashita District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 71p. (in Japanese with English abstract 5p.)