The clerestory shafts are of trefoil section; the arches are all pointed, and contain first pointed mouldings. The west end of the nave and doorway are Norman in character, and Sir Gilbert Scott declared the great western doorway and south doorway to be "perfect gems of refined Norman of the highest class and most artistic finish." The doorpiece is surrounded by three gablets, the central one still retaining a trefoiled arch. The west wall has flat buttresses of Norman character, and "the upper portion of the wall has a central round-headed window, flanked on each side by three small pointed arch heads, the caps carrying which rested on long single free shafts, now gone. The central window has deep mouldings, but no enrichments. The west front has been finished with an octagonal turret on each side, as at Kelso Abbey, and the gable contains a central circular window, which has been filled with tracery at a late date. The west end walls of the aisles have each contained a circular-headed window of Norman design, with a chevron ornament in the arch and a nook shaft at each side." "The lower part of the walls of the choir and the western wall and doorway and south doorway being all of Norman work, it seems probable that the whole building was set out and partially executed in Norman times, and that the work was either stopped for a considerable period and then resumed, or that the structure, after being completed, was destroyed, and had to be restored in the late Transition style. The Transition work is well advanced in style, and may be regarded as being of the date of the end of the twelfth century or beginning of the thirteenth century." "The Norman north transept is fairly well preserved, but both the north and south transepts have undergone great repairs about the end of the fifteenth century. The crossing appears to have been so greatly damaged by the assaults of the fifteenth century that it was found necessary to rebuild it. The restoration is distinctly visible in the south-east pier of the crossing, the style of which is quite different from that of the Norman work adjoining in the choir and south transept, and the junction of the new work with the old is very apparent. This pier has clearly been rebuilt. It is plain next the crossing, but next the aisle it consists of a series of shafts with a moulded cap of late date. The upper mouldings of the cap form a continuous straight line, while the bells of the caps are broken round the shafts--a style of cap common in Scotland at the end of the fifteenth century."