Post-glacial environmental changes and human adaptations in the area along the bay of Volcano.

在这个项目中，我们在北海道Date市的Usu-6遗址进行了考古发掘，并在邻近地区进行了地形普查和测绘。该项目旨在评估人类适应与自然环境变化之间的关系，特别是在过去的一万年中，火山活动和火山湾沿岸地区的海平面变化。我们的研究提供了以下结果。首先，从Usu-6遗址中发现的年代更久远的材料表明，原始绳纹时期的Urahoro型陶器的年代位置大致相似，可追溯到公元前6240年至6080年之间。这证实了Usu-6遗址是北海道已知最古老的贝壳堆之一。其次，我们确定乌苏山的扇形崩塌，形成了位于乌苏6遗址的丘状山丘，至少可以追溯到公元前17620年至17480年，尽管之前认为它在公元前9000年至7000年之间。第三，对现有动物遗骸的分析表明，最初和早期绳纹人将在海岸礁石采集的大量牡蛎带到了臼苏6遗址。之后，他们在2号岩石掩体周围对牡蛎进行热处理，并将它们遗弃在毗邻的1号岩石掩体周围。最后，我们揭示了从绳纹后期到绳纹末期，岩石掩体曾被间歇性地用作狩猎的临时营地。

In this project, we conducted an archaeological excavation at the Usu-6 site, Date city, Hokkaido, and general survey and mapping of topography in the neighboring area. The project aims to assess the relationship between human adaptations and the changes of natural environment, especially the volcanic activities and sea-level changes in the area along the bay of volcano for the past 10,000 years.Our research provides the following results. First, the older age range of materials from the Usu-6 site places approximately similar chronological position of the Urahoro type potteries during the Initial Jomon, which dated between cal BC 6,240 and 6,080. This confirms that the Usu-6 site is one of the oldest known shell midden in Hokkaido. Second, we identify that the sector collapse of Mt. Usu, forming the hummocky hill located the Usu-6 site, is dated at least before cal BC 17,620〜17,480, although it was previously thought to be between 9,000 and 7,000 yrs BP. Third, the analysis of available faunal remains suggests that the Initial and Early Jomon peoples brought abundant oysters collecting at the shore reef into the Usu-6 site. After that, they heat-treated their oysters around the rock shelter No.2, and abandoned them around the adjoining rock shelter No.1. Finally, we reveal that rock shelters had been used intermittently as the location of temporary camps in hunting from the Late to Final Jomon.