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

Archaeologists were able to survey the site after the bane and scrub were cleared. There were pits in a horseshoe formation.

The pits may have formed a complete ring but ground conditions at the time of the survey left archaeologists unable to gather clear data on the northern part of the henge interior.

Some stones were removed and taken elsewhere, while others were pushed into the pits in which they used to stand.

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It is thought that Castilly Henge was built during the late Neolithic period. The henge was defined by an external bank and an internal ditch.

Volunteers stand on the seven pits found at Castilly Henge near Bodmin.

Volunteers stand on the seven pits found at Castilly Henge near Bodmin. Photograph: Historic England/CAU/PA

There is only one stone circle in Cornwall, and it is on the slopes of the Bodmin Moor. Archaeologists think that henge sites would have been used for rituals.

Historic England included Castilly Henge in a scheme to conserve and repair monuments on its at-risk register.

The site was cleared by volunteers from the Cornwall Archaeology Unit. The first detailed surveys of Castilly Henge were carried out by teams from Historic England.

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The management of the amazing archaeological site has been improved with re-fencing, according to a senior archaeologist.

The research at Castilly Henge has given us a deeper understanding of the site and its importance to Cornish history over thousands of years. It will help us make decisions about the way the monument is presented, so that it can be enjoyed by generations to come.

There is evidence that Castilly Henge was used as a gun emplacement during the English civil war.