other sites on the east coast and at lochs and rivers, and large numbers of rock shelters and shell middens around the west coast and islands, build up a picture of highly mobile people, often using sites seasonally and having boats for fishing and for transporting stone tools from sites where suitable materials were found. finds of flint tools on ben lawers and at glen dee (a mountain pass through the cairngorms) show that these people were capable of travelling well inland across the hills.