TL dating of both quartz and potassium feldspar grains from the Pleistocene beach of Sangatte, at the southern limit of the North Sea Basin, give self-consistent ages of 200,000 ± 45,000, 205,000 ± 14,000, and 229,000 ± 18,000 years, respectively. These results allow the beach deposits to be correlated with oxygen isotope stage 7 (244,000–190,000 yr) (Martinson et al., 1987). The existence of a fossil beach cliff line at 10 m above French O.D. demonstrates that the Strait of Dover was open during the penultimate interglaciation.