Oldowan tools produced from these softer stones would either dull quickly or shatter, making them poor materials to use. Archaeologists previously discovered similar rocks that hominins transported to a separate, 2-million-year-old site on the Homa Peninsula. While those were the oldest known examples of Oldowan tools, these Nyayanga kits were fashioned around 600,000 years earlier. A variety of rocks from the two types were used to manufacture the Oldowan tools at Nyayanga. Oliver / Homa Peninsula Paleoanthropology ProjectThe latest findings further clarify the evolutionary timeline for humans, indicating that some cognitive advancements happened much earlier than initially understood.