 These include direct radiocarbon dating of the stones composing the Bimini Road and Uranium-thorium dating of the marine limestone on which the Bimini Road lies.In 1978, the radiocarbon laboratory operated by the Department of Geology at the University of Miami dated samples from a core collected by E. A. Shinn in 1977 from the Bimini Road.In 1979, Calvert and others reported dates of 2780±70 yr BP (UM-1359), 3500±80 yr BP (UM-1360), and 3350±90 yr BP (UM-1361) from whole-rock samples; a date of 3510±70 yr BP (UM-1362), from shells extracted from the beachrock core; and dates of 2770±80 yr BP (UM-1364) and 2840±70 yr BP (UM-1365) from carbonate cementing the beachrock core.