The fourth tomb we visited on our mini tour was a boulder burial, A massive glacial erratic has been raised up and held in position with chocking stones and a burial chamber carved out of the limestone. (megalithicireland.com)

Stone circles are generally regarded as ceremonial or ritual sites. The stone circle at Dromagorteen, known as the Judge and Jury, consists of thirteen stones with a central boulder burial. (Bonane)

Some of the circles have a boulder burial within them. Boulder burials are very simple in plan and are just what they describe, a burial, usually cremated, with a large boulder marking the spot. (ballybegvillage.com)