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Ak4 Tephra Hasegawa and Nakagawa, 2007
Abbr.: Ak4
- Type locality: Mosetsuri, Tsurui city, Akan county, Hokkaido
- Tephra
- Pleistocene
- Sedimentary facies: Terrestrial
- Lithofacies (Upper): Pyroclastic flow deposit
- Lithofacies (Lower): Pumice fall deposit
- Akan pyroclastic deposit (Akan volcano)
- [ Upper ]
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- Ak1
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- Ak2
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- Ak3
- ~~~~~~~~~~~~~~
- Ak4
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- Ak5
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- Ak6
- ~~~~~~~~~~~~~~
- Ak7
- ~~~~~~~~~~~~~~
- Ak8
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- Ak9
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- Ak10
- ~~~~~~~~~~~~~~
- Ak11
- ~~~~~~~~~~~~~~
- Ak12
- ~~~~~~~~~~~~~~
- Ak13
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- Ak14
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- Ak15
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- Ak16
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- Ak17
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: south of Akan caldera, Akan county, Hokkaido; Kyowa, Akan town, Kushiro city, Hokkaido; Mosetsuri - Kuchoro river - Aishinai river, Tsurui city, Akan county, Hokkaido
- Hasegawa et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.7, pp.366-381 DOI
- Hasegawa and Nakagawa (2007) Jour. Geol. Soc. Japan, vol.113, no.2, pp.53-72 DOI