The earliest evidence of human occupation in the wider area are microliths from the hunter-gatherers of the Mesolithic period (the Middle Stone Age, about 8000–3500 BC) and weapons and stone tools from the Neolithic period (the New Stone Age, 3500–2000 BC). Early Bronze Age (2000–1200 BC) remains include stone hammers, flint knives, palstaves (bronze axe heads), and funerary urns; all finds were chance discoveries, not the results of systematic searches of a known site. There is a gap in the age of finds between about 1200 BC and the start of the Roman period in about 70 AD, which may indicate depopulation, possibly due to a poorer climate.