Just to the east of the cannon grouping, a millstone was discovered in 1997, although it was not excavated until 1998. Markings on the millstone are believed to refer to the weight and maker, although it is not yet known for certain what these markings refer to.
Several millstones were discovered on the site. The one pictured above was not excavated until 1998. It measured 20 inches (50 cm) in diameter, 3 inches (7 cm) thick, and the center hole was 2 ½ inches (6 cm) in diameter. The markings “0-3-0” (shown more clearly in the drawing to the left) indicate that the millstone weighs three quarters of a hundredweight, or 84 pounds. There is also an “O” and some cross hatch markings on the face of the millstone below the center hole.