This episode is a little different. We are looking at an event—actually two events—that we only really know through archaeology, because nothing that we've found in the written record references it. I’m talking about the two eruptions of Mount Haruna in the early and mid 6th centuries.

For more, check out some of the links we have below in the References section.

If you want to see more, check out photos I’ve pulled out for the Kofun period in the 6th century, over on Flickr.

The Tone River

A quick note about the Tone River. Although the modern river runs to the Pacific ocean on the coast of modern Chiba prefecture, the original river used to run south, through modern Tokyo and flowing into Tokyo Bay. During the Edo period (1654), to avoid flooding, the river was redirected into a nearby watershed, creating the current geography. This river has long been important in the Kanto plain, as evidenced by the communities that grew up along its banks.

References

• -. -. 金井遺跡群. Gunma Archaeological Research Foundation. http://www.gunmaibun.org/kanaiura/. Last viewed on 5/31/2023.

• -. -. 黒井峰遺跡:Kuroimine Iseki.  Cultural Heritage Online.  https://bunka.nii.ac.jp/heritages/detail/216059.  Last viewed on 5/31/2023.

• Okuno, Mitsuru, et al.  (2019). Eruption age of the Haruna Futatsudake Pumice (Hr-FP), central Japan, by radiocarbon wiggle matching with special reference to a 14C dataset developed from a Japanese tree. Quaternary International, vol 527, 30 August 2019, pp. 29-33

• -. -. (2018). Kanai Higashiura. Japanese Journal of Archaeology. https://archaeology.jp/remains/kanai-higashiura/. Last viewed on 5/31/2023.

• 早田 勉. (1989).「 6世紀における榛名火山の2回の噴火とその災害」. 第四紀研究1989 年 27 巻 4 号 p. 297-312. https://doi.org/10.4116/jaqua.27.297