Robert Clarkのインスタグラム(robertclarkphoto) - 12月15日 02時16分

A fast moving group of adults and adolescents left footprints on volcanic ash in the Pleistocene, providing ancient evidence offsets humans on move in East Africa. The tracks are preserved at Engare Sero in Tanzania beneath a still active volcano. To see the image and others about human exploration see the Jan 2013 National Geographic. @ナショナルジオグラフィック #humanevolution #tanzania

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