Uranium-series dating shows South African midden is earth’s oldest
University of California – Berkeley
IMAGE Ancient ostrich eggshells from Ysterfontein 1, A middle Stone Age midden in South Africa. Shown are chosen eggshells from the layer that is top of midden dated by Uranium-Thorium (U-Th, or. view more
Credit Image courtesy of E. Niespolo.
Archeologists have learned a great deal about our ancestors by rummaging through their trash piles, that incorporate pr f of their diet and populace amounts as the flora that are local fauna changed as time passes.
One common kitchen scrap in Africa — shells of ostrich eggs — is currently helping unscramble the secret of when these modifications happened, supplying a timeline for many associated with homo sapiens that are earliest who settled down to utilize marine f d resources over the South African coast more than 100,000 years back.
Geochronologists during the University of California, Berkeley, therefore the Berkeley Geochronology Center (BGC) are suffering from a method that uses these discards that are ubiquitous exactly date garbage dumps — politely called middens — which are t old to be dated by radiocarbon or carbon-14 methods, the conventional for materials like bone tissue and w d which can be younger than about 50,000 years.
In a paper published this thirty days in the journal Proceedings associated with the nationwide Academy of Sciences, former UC Berkeley student that is doctoral Niespolo www ldssingles org and geochronologist and BGC and associate manager Warren Sharp reported using uranium-thorium dating of ostrich eggshells to ascertain that a midden outside Cape Town, South Africa, had been deposited between 119,900 and 113,100 years ago.بیشتر بخوانید