The Tompson Street Reservation is the largest property within the Greenbelt Reservation system. It features exposed bedrock known as Cape Ann granite,vernal pools woodland and swamp. There are traces of many trails that used to be wagon paths for early settlers to access their woodlots, but have since been overgrown with scrub growth. The land consists mainly of young trees and shrub growth due to numerous fires, the most devastating occurring in 1947, and the most recent in the summer of 1993.