When the Madison chimneypiece was removed and replaced in ca. 1882, the ca. 1812 hearth was also replaced with a new marble hearth in ca. 1882.  When the Restoration Team removed the ca. 1882 hearth, the setting bed for the ca. 1812 hearth was found intact under the later stone.  The ca. 1812 setting bed was important because it showed that the original hearth was made from one piece of a fairly thick stone with a rough bottom surface that included long, narrow tool marks.  These types of tool marks are common on stones shaped before the industrial revolution and so it suggested that the missing hearth stone dated to the Madison-era.  But where was the original stone and what did it look like?