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Discarded ostrich shells provide schedule for our early African ancestors

Discarded ostrich shells provide schedule for our early African ancestors

120 thousand years back. Credit E. Niespolo.

dating at 20

Archeologists have discovered a lot about our ancestors by rummaging through their trash heaps, that have evidence of their diet and population levels as the neighborh d flora and fauna changed over time.

One common home scrap in Africa—shells of ostrich eggs—is now helping unscramble the secret of whenever these changes happened, supplying a timeline for some of the earliest Homo sapiens who settled down to utilize marine meals resources along the South African coastline a lot more than 100,000 years ago.

Geochronologists during the University of Ca, Berkeley, and the Berkeley Geochronology Center (BGC) allow us an approach that makes use of these ubiquitous discards to properly date garbage dumps—politely called middens—that are way t old to be dated by radiocarbon or carbon-14 techniques, the standard for materials like bone and lumber which can be more youthful than about 50,000 years.

In a paper published this thirty days in the log Proceedings of the nationwide Academy of Sciences, former UC Berkeley student that is doctoral Niespolo and geochronologist and BGC and connect manager Warren Sharp reported using uranium-thorium dating of ostrich eggshells to establish that the midden outside Cape Town, South Africa, had been deposited between 119,900 and 113,100 years back.

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