Measuring over two and a half metres in length, the slab was carved in low relief with considerable care: an interlace cross whose arms terminate in fleur-de-lys flourishes, a calvary mount at the base with a skull and bone carved within it, and two heraldic shields flanking the cross-shaft. One shield bears a portcullis over stag's antlers with the initials G. S.; the other shows a lion rampant above the initials M. C. Running along the top and right border, and continuing in two lines at the foot, is a Latin inscription in black-letter script. The slab has since split lengthwise in two places and cracked further at the lower left corner, but enough survives to read.

The inscription commemorates Geoffrey Sall, son of Patrick, and his wife Margaret Corcran, described as citizens of Cashel. The text records that Geoffrey died in the year of Our Lord 1622, and that the couple had the monument made for themselves and their descendants while still living, conscious, as the Latin puts it, of human mortality. What makes the slab genuinely odd is that large sections of the inscription were never filled in. The day and month of Geoffrey's death are blank. His age at death is blank. Margaret's year of death and her age are blank. These gaps were apparently left to be completed later, as the need arose, and they never were. A sketch and transcription published by FitzGerald in 1902, with a translation by Garstin, confirms that the blanks are original omissions rather than losses to weathering or damage. The slab sits in a graveyard that itself occupies the site of a medieval church, with the Bolton Library, one of Ireland's oldest surviving libraries, just to the west.