Archaeologists in Britain say an ancient ring of tree trunks found on a beach in Norfolk could be as significant as Stonehenge for underdstanding the beliefs of pre-historic people.

The find is similar in appearance to Stonehenge -- it comprises an upturned oak tree in the centre of a circle of more than fifty smaller oaks.

They were revealed by shifting sands and are said to be about four thousand years old.

Researchers say the structure may have been used in religious rituals.