The water levels continued to rise during the Mesolithic period and Britain finally became cut off from the Continent. In Hertfordshire, the Mesolithic people then spread onto the drier land in the upper reaches of the Lea and Colne river system and also began to colonise some of the more heavily wooded areas of the county. In particular, evidence is beginning to suggest that the clay-with-flints areas of the Chilterns appear to have been a favoured area for settlement. The land provided an abundant supply of raw material for tools (the flint), and the wooded areas would have provided a good supply of game.
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