Madison Boulder – Madison, New Hampshire - Atlas Obscura
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Madison Boulder

Wayside Geological Park
Madison, New Hampshire

A very big rock just plopped down in the New England woods.  

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Madison Boulder Natural Area in Madison, New Hampshire, USA nhgeology.org (none)
Madison Boulder Natural Area in Madison, New Hampshire, USA nhgeology.org (none)
One Man vs. Glacial Erraticism Willymjr (Atlas Obscura User)
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Madison Boulder is thought to be the largest glacial erratic - an erratic being a boulder of a certain type of rock that was transported by glacial ice and deposited on bedrock of different type of rock - in North America.

At 23 feet high, 37 feet front-to-back, and 85 feet left-to-right Madison Boulder is estimated to weigh almost 12 million pounds, roughly the weight of 36 blue whales. It was once part of a ledge of Conway Granite and was transported about two miles south to its current location where it now sits on a deposit of Concord Granite.

Know Before You Go

If you follow the signs to the park you'll end at a small parking lot. It's about 10 minutes down the trail to the boulder.

geological oddities natural wonders geology nature
Nearby
Castle in the Clouds
16.76 miles
The Old Country Store and Museum
16.98 miles
Willey House Site
18.22 miles
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