Today I read the following news on the SciencePortal.
The Sannai-maruyama site was decayed by the cooler climate (JAPANESE)
This press release is here (JAPANESE).
The following paper is related to this news, and I introduced it in the last June.
- Hodaka Kawahata, Hisashi Yamamoto, Ken’ichi Ohkushi, Yusuke Yokoyama, Katsunori Kimoto, Hideki Ohshima, and Hiroyuki Matsuzaki. 2009. Changes of environments and human activity at the Sannai-Maruyama ruins in Japan during the mid-Holocene Hypsithermal climatic interval. Quaternary Science Reviews 28: 964–974.