Rare stone circle found at prehistoric ritual site in Cornwall

Volunteers cleared Castilly Henge of bracken and scrub in winter so archaeologists could map the stone circle using modern surveying techniques. Photograph: Historic England/CAU/PA

A rare stone circle has been found at a prehistoric ritual site in Cornwall, with seven regularly spaced pits mapped by a team of archaeologists.

Bracken and scrub were cleared over the winter at Castilly Henge near Bodmin to allow archaeologists to survey the site. They found the pits lying in a crooked horseshoe formation.