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Ak5 Tephra Hasegawa and Nakagawa, 2007
Abbr.: Ak5
- Type locality: Kyowa, Akan town, Kushiro city, Hokkaido
- Tephra
- Pleistocene
- Sedimentary facies: Terrestrial
- Lithofacies (Upper): Pumice fall deposit
- Lithofacies (Lower): Pyroclastic flow deposit
- Source: Akan volcano
- Thickness (Pumice fall): ca. 80 cm or thicker
- Thickness (Pyroclastic flow): ca. 6 m or thicker
- Upper limit: Unconformity (Ak4)
- Lower limit: Unconformity (Ak6)
- Akan pyroclastic deposit (Akan volcano)
- [ Upper ]
- ~~~~~~~~~~~~~~
- Ak1
- ~~~~~~~~~~~~~~
- Ak2
- ~~~~~~~~~~~~~~
- Ak3
- ~~~~~~~~~~~~~~
- Ak4
- ~~~~~~~~~~~~~~
- Ak5
- ~~~~~~~~~~~~~~
- Ak6
- ~~~~~~~~~~~~~~
- Ak7
- ~~~~~~~~~~~~~~
- Ak8
- ~~~~~~~~~~~~~~
- Ak9
- ~~~~~~~~~~~~~~
- Ak10
- ~~~~~~~~~~~~~~
- Ak11
- ~~~~~~~~~~~~~~
- Ak12
- ~~~~~~~~~~~~~~
- Ak13
- ~~~~~~~~~~~~~~
- Ak14
- ~~~~~~~~~~~~~~
- Ak15
- ~~~~~~~~~~~~~~
- Ak16
- ~~~~~~~~~~~~~~
- Ak17
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kyowa, Akan town, Kushiro city, Hokkaido; Mosetsuri, 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