The Old Crow Flats and basin was one of the areas in Canada untouched by glaciations during the Pleistocene Ice ages, thus it served as a pathway and refuge for ice age plants and animals. The area holds evidence of early human habitation in Canada dating from about 12,000. Fossils from the area include some never accounted for in North America, such as hyenas and large camels. Bluefish Caves is an archaeological site in Yukon, Canada from which a specimen of apparently human-worked mammoth bone has been radiocarbon dated to 12,000 years ago.