I have an ancestor, Mary A. Stone born about 1816 in Maryland by 1850-1860 censuses, married Alexander Mateer about 1833 in Shippensburg, PA. Only parental hint is an adjacent George Stone in Cumberland County, PA. in 1830 census who would be born about 1785.
I've located several potential George Stones for this period in Frederick County and Calvert County, MD.