Madison Boulder, Glacial erratic in Madison, United States.
The Madison Boulder is an enormous granite block rising from the forest floor in Madison, New Hampshire. This single rock dominates the landscape around it, with trails winding through the surrounding woodland area.
The stone was transported and deposited by glaciers roughly 14,000 years ago during the last ice age. This movement shows the tremendous power that ice sheets wielded as they shaped the landscape.
The New Hampshire Division of Parks and Recreation manages this National Natural Landmark, which received its designation from the National Park Service in 1970.
The natural area is open year-round for visitors to explore on foot through woodland trails. Winter conditions can bring snow and ice to the paths, so sturdy footwear and careful footing are advisable.
It is the largest documented glacial erratic in North America, and its sheer size makes it difficult to take in all at once. Visitors often stand in wonder trying to grasp how a single stone of such enormous size ended up in this location.
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