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Today KNM–ER 1470 is generally believed by long-agers to be around 1.9 million years old—a million years younger than Leakey’s official ‘date’. A lot of people, including many scientists who are not geologists, believe that long-age radioisotope dating provides a reliable and empirical measurement of real age. Long-age-believing scientists decide on the age of rock formations according to their naturalistic, secular philosophy, using pre-conceived fossil ages that fit evolutionary assumptions and which trump all other considerations.Like the sandpiper track discovery in the Santo Domingo formation, Leakey’s hominid fossil discovery resulted in a massive change in the radiometric date for the rock formation. What if a rabbit fossil was found in ‘Precambrian’ rock?
In the first, the geologists already believed the formation to be around 200 million years old on the basis of an extinct fossil tree—and they received a date very close to this from the laboratory.Because it was found below this volcanic layer, Leakey estimated his newly-discovered and soon-to-be-famous fossil KNM–ER 1470 was 2.9 million years old.This date was popular for a while, but was eventually challenged by other paleontologists using further radioisotope dating.by Jonathan O'Brien Using well-known radioisotope technology, scientists dated the Santo Domingo rock formation in Argentina at 212 million years old.This happened to agree well with a nearby geologic formation that was also radiometrically dated.