Framed in red sandstone ashlar, its round-headed arch is Romanesque in style, with the jamb and two springing stones surviving on the south side. A projecting stone with a socket hole sits halfway up the south jamb, facing inward, its original purpose now unclear. Stranger still, scattered across the external faces of the lower wall courses are small groups of three incised notches, arranged in a rough triangular pattern. The same markings appear at Killeenemer, another Romanesque church in County Cork, which suggests they were not accidental but no one has yet established with certainty what they meant.