Njoro River Cave was first excavated in 1938 by Mary Leakey and her husband Louis Leakey. Dated to roughly 1,000 BC, the excavations revealed a mass cremation site. They also uncovered pottery, beads, stone bowls, basket work, pestles and flakes. The Leakey's excavation was one of the earliest to uncover ancient beads and tools in the area and a later investigation in 1950 was the first to use radiocarbon dating in East Africa.[1]