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Ak13 Tephra Hasegawa and Nakagawa, 2007
Abbr.: Ak13
- Type locality: Kuchoro river, Tsurui city, Akan county, Hokkaido
- Tephra
- Pleistocene
- Sedimentary facies: Terrestrial
- Lithofacies: Pumice fall deposit, Scoria flow deposit
- Ak13
- [ Upper ]
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- Ak13-a
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- Ak13-b
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- [ Lower ]
- Akan pyroclastic deposit (Akan volcano)
- [ Upper ]
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- Ak1
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- Ak2
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- Ak3
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- Ak4
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- Ak5
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- Ak6
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- Ak7
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- Ak8
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- Ak9
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- Ak10
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- Ak11
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- Ak12
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- 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: Upper reaches of Kuchoro river, Tsurui city, Akan county, Hokkaido; Kamisato, Tsubetsu city, Abashiri 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