Validity of carbon dating
I read the scientific article on the carbon dating done on the Jericho site written by Bruins and Van Der Plicht.
How certain are you that carbon dating is reliably able to give us dates back to 50KYA? W., 1993, A large drop in atmospheric 14-C/12-C and reduced melting in the Younger Dryas*, documented with 230-Th ages in corals: Science, vol. Establishment of a 7484-year chronology in the White Mountains of eastern-central California, USA.
See: The walls of Jericho, The story of Jericho, and Q and A pages on the Ice Age and radiometric dating. Einstein also said something like, "A thousand experiments cannot prove me right.
See also this useful offsite resource: Jericho chronology dispute. A single experiment can prove me wrong." Please consult our Radiometric Dating Q&A section for answers to many of the questions you are asking. Carter incorrectly states "The rate of decay is also not in question.".
But, lets be extremely conservative and say a 50,000 years old date is off by half. Kitagawa, H., and van der Plicht, J., (1998), Atmospheric radiocarbon calibration to 45,000 yr B.
That still puts the earth at over 20,000 years old. P: Late glacial fluctuations and cosmogenic isotope production, Science, v.