To date the new artifacts, the team used a technique called optically stimulated luminescence, or OSL, which reveals the last time a mineral was exposed to sunlight.

迄今为止，该团队使用了一种称为光激发光 (OSL) 的技术来确定新人工制品的日期， 该技术揭示了矿物最后一次暴露在阳光下的时间。