What is known of pre-Christian Ireland comes from references in Roman writings, Irish poetry and myth, and archaeology. While some possible Paleolithic tools have been found, none of the finds are convincing of Paleolithic settlement in Ireland.[2] However a bear bone found in Alice and Gwendoline Cave, County Clare, in 1903 may push back dates for the earliest human settlement of Ireland to 10,500 BC. The bone shows clear signs of cut marks with stone tools, and has been radiocarbon dated to 12,500 years ago.[3]