The town is home to the Madison Boulder (43°55′52″N 71°10′04″W), the largest known glacial erratic in New England, and among the largest in the world.
Madison Boulder is a huge granite rock measuring 83 feet (25 m) in length, 23 feet (7.0 m) in height above the ground, and 37 feet (11 m) in width.
It weighs upwards of 5,000 tons.
A part of this roughly rectangular block is buried, probably to a depth of ten to twelve feet.
It is located at a state park in the northwest part of town.
In 1970, Madison Boulder was designated as a National Natural Landmark by the National Park Service.
The town is home to the Madison Boulder (43°55′52″N 71°10′04″W), the largest known glacial erratic in New England, and among the largest in the world. Madison Boulder is a huge granite rock measuring 83 feet (25 m) in length, 23 feet (7.0 m) in height above the ground, and 37 feet (11 m) in width. It weighs upwards of 5,000 tons. A part of this roughly rectangular block is buried, probably to a depth of ten to twelve feet. It is located at a state park in the northwest part of town. In 1970, Madison Boulder was designated as a National Natural Landmark by the National Park Service.
Madison, New Hampshire