There is evidence of humans in North Devon from Mesolithic times onward. Worked pieces of flint or stone, known as flint scatters, that date to this era have been found around Baggy Point in an area where flint does not occur naturally. In the clays beneath the sand of Westward Ho! beach there is a Mesolithic midden, a prehistoric dump for domestic waste, composed of mussels, cockles, peppery furrow shells (Scrobicularia plana), and carpet shells (Venerupis spp.). On Exmoor the remains of small flint tools called microliths, used by hunter-gatherers to hunt and prepare animals, have been found and date to the late Mesolithic. In the Neolithic period, people started to manage animals and grow crops on farms, and started to cut down the woodlands of Exmoor, rather than act purely as hunters and gatherers. These Neolithic people created stone monuments and by the Bronze Age were creating barrows (burial mounds) and roundhouses. Evidence shows that extraction and smelting of mineral ores to make metal tools, weapons, containers and ornaments had started by the Iron Age. Bronze Age barrows have also been found on elevated parts of Bursdon Moor, near Hartland and on Berry Down, near Berrynarbor. Iron Age hill forts were built on prominent parts of the coastline and hinterland. Examples can be found at Hillsborough near Ilfracombe, Embury Beacon and Clovelly Dykes in the Hartland area, with numerous other examples along the coast.