Koiwai Pumice Deposit

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Koiwai Pumice Deposit Nakawagawa et al., 1963

Abbr.: KP

Invalid synonym: AK-h, Ak-K

Type locality: Koiwai, Morioka city, Iwate prefecture
Tephra
Pleistocene (13.5, 16.3 ka, ¹⁴C)
Correlation: W12

Lithofacies: Pumice, Sandy volcanic ash

Source: Akita-Komagatake volcano
Thickness: ca. 60 - 150 cm more thicker

Koiwai Pumice Deposit
[ Upper ]
~~~~~~~~~~~~~~
K1P
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K2P
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K3P
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[ Lower ]

.Syn-caldera formation stage
[ Upper ]
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Yanagisawa Pumice Deposit
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Obonai Pyroclastic Flow Deposit
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Koiwai Pumice Deposit
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[ Lower ]

Akita-Komagatake volcano
[ Upper ]
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Post-caldera eruption stage
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Syn-caldera formation stage
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Main strato cone stage
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[ Lower ]

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

Distribution: Koiwai, Morioka city, Iwate pref.; Wakare, Sugo, Takizawa city, Iwate pref.; Kuzakai, Miyako city, Iwate pref.

Kawamura et al. (2013) Geology of the Hayachine San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
Suto and Ishii (1987) Geology of the Shizukuishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 142p. (in Japanese with English abstract 5p.)