At the west end of this crypt a portion had been enclosed in walls and filled up with earth. The eastern part was vaulted, and had stout Norman pillars at the side, while in the middle were two rows of smaller single pillars. The earth has since been removed, and the building laid open, repaired, and vaulted.
The thicker pillars are of elaborate late Norman work, diapered in a manner recalling the piers of the nave at Durham. The vault was ribbed. These pillars were, no doubt, erected by Roger Pont l'Evêque, and enable us to understand what the character of his choir must have been.
The walls enclosing the western part of the crypt are of peculiar interest. They are made up of three partitions. The outer wall, 3 feet 6 inches thick, is, no doubt, the work of Roger. The middle wall, 4 feet 8 inches thick, is faced with herring-bone work, and this, and the coarseness of its workmanship, prove it to be of great antiquity. It is almost undoubtedly Saxon, and has been supposed, though on slender evidence, to be part of the original church begun by Edwin in the seventh century. A bit of this wall is now bare, and may be seen.
The third wall is only 2 feet thick. It probably was also erected by Roger, but it is composed of older materials of an early Norman character. It may be from Thomas's choir, if, as is probable, the earlier choir which Roger pulled down had been built by Thomas. The stone of this wall is of the same coarse sandstone as the remains of Thomas's apse under the north transept, and there are traces of plaster on the stones showing that they had been used for the interior of a building.
No doubt the outer wall was erected by Roger as a support for his massive piers, for which purpose the middle wall alone would have been insufficient. Roger also probably added the thin inner wall, and filled the whole with earth, for the same purpose.
Close to the remains of the Norman doorway before mentioned, is a low arch, and the portion of an apse, no doubt the work of Thomas, the apse being the eastern termination of his transept.