Isochron dating add message
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Little Foot is a rare, nearly complete skeleton of Australopithecus first discovered 21 years ago in a cave at Sterkfontein, in central South Africa.
"We have only a small number of sites and we tend to base our evolutionary scenarios on the few fossils we have from those sites.
This new date is a reminder that there could well have been many species of Australopithecus extending over a much wider area of Africa." There had not been a consensus on the age of the Little Foot skeleton, named for four small foot bones found in a box of animal fossils that led to the skeleton's discovery.
Stone tools found at a different level of the Sterkfontein cave also were dated at 2.18 million years old, making them among the oldest known stone tools in South Africa.
These isotopes are only created when the rock is exposed to cosmic rays.If a strong isochron line forms, it increases the confidence that the samples on the line meet the criteria to be good candidates for accurate dating.Samples that have been compromised, due to reburial or natural movement of sediment within a site, fall above or below the line can be tossed out of the analysis, Granger said.This sense of "replaceable-ness" (to the left, to the left!) leads to lots of poor behavior, which has been well documented in screenshots.
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