Some granite and limestone deposits are quarried, although the state has many deposits of both. Slate deposits are located near Brownville and Monson in the central part of the state. One of the main elements of the Maine's mining industry is limestone, which is crushed for use in cement. Both Knox and Aroostook counties have limestone quarries. Cumberland and Penobscot counties both produce sandstone, which is crushed for use.
Yale Peabody Museum: GNIS (Search the USGS Geographic Names Database)
Mr. Grierson's ancestors worked in the worked the quarries in Spruce Head and Clarks Island, Maine
“The Pratt Family of Stonecutters,” by Ralph L. Tucker, in Markers XIV, Association for Gravestone Studies, 1997. (Maine, Massachusetts, USA)