Acton Select Board Members Jim Snyder-Grant and Dean Charter met their counterparts from Littleton to “mark the monuments,” a centuries-old English tradition last observed there on that side of Acton in 1986. (Select Board members marked the monuments at the intersection with Stow and Boxborough in November, 2016; those monuments had been marked previously in 2005.) Modern surveying methods and GPS have long-since made physical markers obsolete. But Massachusetts General Law 42 still requires every municipality’s executives to meet their neighbors and mutually agree on borders every five years. Failure to do so can result in a fine of $5,…