Long barrows, dolmens and passage graves
The shape of burial mounds changed during the Neolithic period. The so-called long barrows are the earliest, next came the dolmens and afterwards the passage graves.
The earliest long barrows (3800-3500 BC)
Not long after the introduction of agriculture farmers began building monumental tombs for people of special importance. At first they built long barrows of earth over wooden burial chambers. The earthen long barrows were oriented east-west and were widest at the eastern end, where there was a façade of large posts. This was where rituals took place. The long barrows of earth and wood were precursors of the dolmens with their chambers of stone.