Barrow – a mound of earth or stones over a grave.
Cairn – man-made pile or stack of stones.
Knapping – shaping of flint and other stones with a hammer to make tools, weapons, building materials or decorative items.
Longbarrow – an earth mound, normally a collective tomb.
Neolithic – period ranging roughly between 4,500 BC – 2,000 BC.
Silted – to be filled with silt, a fine deposit of mud or clay generally found in a river or lake.