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Image caption Neolithic pottery was previously found near crannogs in the Western Isles. Archaeologists have discovered that some Scottish crannogs are thousands of years older than previously thought. Crannogs were fortified settlements constructed on artificial islands in lochs. It was thought they were first built in the Iron Age, a period that began around 800 BC. But four Western Isles sites have been radiocarbon dated to about 3640-3360 BC in the Neolithic period - before the erection of Stonehenge's stone circle. The prehistoric monument in Wiltshire is one of Britain's best-known Neolithic features. Stonehenge's stone circle was erected in the late Neolithic period, about 2500 BC. ... Full story

13 June