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 also contain ostrich eggshell ornaments produced by early Homo sapiens.

Elizabeth Niespolo, during the time a graduate student in UC Berkeley’s Department of world ...

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