 As a result, the location from where Gifford and Ball collected the sample of limestone was between (295 and 312 feet) above sea level at the time indicated by the uranium-thorium date of 14,992±258 BP (7132-19/2).Therefore, it is physically impossible for the marine limestone underlying the Bimini Road to have accumulated around 15,000 BP.Thus, this uranium-thorium date is a meaningless, invalid date lacking any scientific significance.