About Glen Rock
Glen Rock is a borough in Bergen County, New Jersey, United States. Glen Rock was formed on September 14, 1894, from portions of Ridgewood Township and Saddle River Township, "that being the year the county went crazy on boroughs". Glen Rock was settled around a large boulder in a small valley (glen), from which it gets its name. The boulder, a glacial erratic weighing in at 570 short tons (520 t) and located where Doremus Avenue meets Rock Road, is believed to have been carried to the site by a glacier that picked up the rock 15,000 years ago near Peekskill, New York and carried it for 20 miles (32 km) to its present location.