日本对旧石器遗址的认真调查开始于1949年群马县岩宿遗址的发掘。在那以前，被称为关东土壤的火山灰层系晚更新世火山活动的产物，并且认为火山活动不适于人类生存。但是明治大学考古系却从岩宿遗址的土壤层中挖掘出“手斧”、刮削器、石片等，毫无疑问这些出土物属于人工制品 A careful survey of Paleolithic sites in Japan began in the excavation of the Yansu site in Gunma in 1949. Prior to that, the volcanic ash layer known as Kanto Soil was the product of Late Pleistocene volcanic activity and considered volcanic activity unsuitable for human survival. However, the Meiji University Department of Archeology excavated from the soil layer of the Yansu site “hand axes”, scrapers, stone tablets, etc., there is no doubt that these artifacts belong to artifacts