The site of the early medieval keeill known as St Mary's Chapel, or Keeill Moirrey, stands on a mound known as Cronk Keeillane, which is thought to be a possible tumulus or prehistoric burial mound.  The site consists of a grass covered mound, 24.0 metre diameter and 1.6 metre high, with no surrounding ditch and which sits upon a natural mound. The northeast portions have been destroyed by a road and no trace of the chapel or burial ground enclosure remains but it seems likely that the upper mound is the remains of a bowl barrow.