Ashlar

Ash·lar

Ashlar

n.
  1. Hewn or squared stone; also, masonry made of squared or hewn stone. (Masonry)
    Rough ashlar, a block of freestone as brought from the quarry. When hammer-dressed it is known as common ashlar.
    — Knight.
  2. In the United States especially, a thin facing of squared and dressed stone upon a wall of rubble or brick.