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In 1972, during the restoration of the great mosque of Sana, capital of Yemen, workers discovered a mash of old parchments. DR Gerd R Puin, a quranic expert studied the find. Dr Gerd dated it at between 705 and 715. It is the oldest dateable quran in the world but was created 70 years after Muhammads death. fragments from nearly 1000 different Qur'an's were identified. verses and chapters changed and rearranged. so the quran was not a single product or a single entity that was fixed by 650 but developed much, much later hence the overlaying of texts.