The site of Vértesszöllös has yielded a pebble-tool industry, a fragment of the cranium of a primitive form of Homo sapiens, and a vertebrate fauna indicative of the Biharian faunal stage. Samples of travertines underand overlying the hominid-bearing marl are significantly contaminated with detritus, so that calculated U-series disequilibrium ages provide upper limits to the true age. The individual samples, when corrected for a possible initial ₂₃₀Th/₂₃₂Th ratio of one to five, give an average age of 211 ± 13 Ky. By fitting the data to a model consisting of a mixture of authigenic and detrital components, the age is 162 È6 Ky. The travertines appear to have been deposited over a span of about 40,000 years centred at about 185 ± 25 Ky BP. This places their deposition near the beginning of isotope stage 6, much younger than has been generally believed. For other studies of the dating of travertines, see also AATA 17-994, 1963, 19-1121, 20-1471, and 21-253. -- AATA