Settlements and tools dating back to the Stone Age have been unearthed in the peninsula. Mesopotamian artifacts originating from the Ubaid period (c. 6500–3800 BC) have been discovered in abandoned coastal settlements. Al Da’asa, a settlement located on the western coast of Qatar, is the most important Ubaid site in the country and is believed to have accommodated a small seasonal encampment.
Kassite Babylonian material dating back to the second millennium BC found in Al Khor Islands attests to trade relations between the inhabitants of Qatar and the Kassites in modern-day Bahrain. Among the findings were 3,000,000 crushed snail shells and Kassite potsherds. It has been suggested that Qatar is the earliest known site of shellfish dye production, owing to a Kassite purple dye industry which existed on the coast.
