This suggests that when a wave of immigrant farmers arrived from the continent in the Neolithic, the indigenous hunter-gatherers were not wiped out, but instead most likely adopted agricultural practices. Further woodland clearances took place at this stage, and also in the Bronze Age, to make way for agriculture and animal husbandry, although where the soils were poor and made permanent cultivation difficult, clearance led instead to the creation of heathland. Neolithic and Bronze Age burial mounds are particularly numerous throughout much of the county.