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Iw-W5 Tephra Ito et al., 2018
- Type locality: Umagaeshi, Mount Yakushidake, Mount Iwate, Iwate prefecture
- Magmatic eruption deposit
- Holocene (3.6 - 3.4 cal ka, 14C)
- Sedimentary facies: Terrestrial
- Sedimentary facies (Upper): Pyroclastic surge deposit
- Lithofacies (Upper): Sandy volcanic ash, Accretionary lapilli
- Lithofacies (Lower): Scoria
- Eruptive volume: 2.78 x 10-3 km3 DRE
- Thickness (Upper): 5 - 7 cm
- Thickness (Lower): 1 cm or thinner
- W5 Unit
- [ Upper ]
- ~~~~~~~~~~~~~~
- W5 Tephra
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Umagaeshi, Mount Yakushidake, Mount Iwate, Iwate pref.
- Itoh et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.4, pp.271-296 DOI