The re-roofed structure contains an important collection of early stone sculpture, including six early Christian cross-slabs, around forty late medieval grave slabs recovered from the chapel or churchyard, and a Celtic cross which previously stood outside the chapel where a modern blank replacement now stands.
The complete and well-preserved late 8th-early 9th century cross[2] is carved from local grey-green epidiorite.
Its proportions are unusual, with very short side-arms broader than the shaft and upper limb.
The latter shows the archangel St. Michael standing over a serpent (a symbol of triumph over the devil).
There is a circular design at the crossing, with three round objects in the centre, which may symbolise the Holy Trinity.