Feeding ancient cities in South Asia: dating the adoption of rice, millet and tropical pulses in the Indus civilisation.
This means that at the very latest it was written before the first formal texts were supposed to have been collated, and at the earliest it was written before or shortly after Mohammed was born.(They later adjusted this to 2.6 million years, plus or minus 260,000 years, which agreed well with Leakey's belief before dating tests even began.) But dating work on the rock did not stop there.3 More samples were taken. Results this time ranged from 290,000 years up to 19.5 million years!Trying to bring some sense to the results, paleomagnetic determinations were begun.4 Leakey's 1470 fossil was then given an age of three million years. He was given dates ranging from 290,000 years to 221 million years for his 1470 skull, using the supposedly reliable potassium/argon method.“It destabilises, to put it mildly, the idea that we can know anything with certainty about how the Koran emerged — and that in turn has implications for the historicity of Muhammad and the Companions [his followers],” he said.Other very old Korans also seem to confirm that written texts were circulating before Mohammed’s death.