an IGI submission shows 1658 ax marriage date, but this appears a few years too early based upon children's birthdates.
Extracts from the Register of Farnham Parish, Richmond County, Virginia, in Virginia Magazine of History and Biography. (Richmond, Virginia: Virginia Historical Society) 7:1 (Jul 1899):52-64 - BIRTHS.
Jean, dau. Thomas and Anne Glascock, July 10, 1673. Mary, dau. Thomas and Anne Glascock, Jan. 22d, 1690. Frances, dau. Thomas and Anne Glascock, July 14, 1680.
Jean Glasscock, daughter of Thomas & Anne Glasscock, July 10, 1673. Frances, daughter of Thomas & Anne Glasscock, July 14, 1680. Mary, daughter of Thomas & Ann Glasscock, Jan. 22, 1690.