Archaeologist Wayne Jarvis, who has led the dig, said: “What we’ve collected are a large number of very early flint artefacts. It’s an incredibly rare find.
“We know from the shape of the flints that they are from the mesolithic period – about 8,000 years ago.
“We’ve collected about 5,000 pieces of flint in a small area and it seems to have been a site where the arrows were made. The pieces of flint are largely discarded flakes from when the arrowheads were shaped.
“However, there are some complete bits that were probably arrowheads, although it’s possible they had other uses.
“We’ve found nothing like this before.”