One of the first radiocarbon tests for an East African site was run at Yale in the 1950s on charcoal submitted from Louis and Mary Leakey's excavation in 1938 of the mass cremated burials in Njoro River Cave, in the elevated section of the Kenya Rift Valley. This test gave a date of about 1,000 BC for the burials and the rich ‘neolithic’ assemblage, believed to be allied to, if not an integral part of, the Elmenteitan culture. Since that dating test was undertaken during the early years of the radiocarbon method, it has seemed important to have it checked, in view of the volume and variety of ‘neolithic’ materials revealed in recent years by a number of archaeologists in this region and the need to place these in chronological order. Accordingly, Dr. Harry Merrick, archaeologist with the Kenya Museums, arranged with Dr. Marc Monaghan, of the Geology and Geophysics Department at Yale, to run three more tests on charcoal which had been kept at the Museum from the 1938 excavation. This short article records ...