Ages are mounted on some archeological sites older than 50,000 years through argon-argon ( 40 Ar/ 39 Ar) dating of volcanic ash.

Ages are mounted on some archeological sites older than 50,000 years through argon-argon ( 40 Ar/ 39 Ar) dating of volcanic ash. For dating, eggshells are better But ash is not always current. In Africa, nonetheless — and before the Holocene, through the center East and Asia — ostrich eggshells are common. Some web sites […]