Agassiz Rock is a park in Manchester-by-the-Sea, Massachusetts, that is owned and maintained by The Trustees of Reservations. The park's name is from two dramatic examples of large boulders plucked from bedrock and carried by the glaciers.
As the glaciers scoured this landscape, the mass of bedrock forming the hill proved more resistant than the surrounding soil, forcing the bottom of the glacier up and over the hill. The north side was smoothed and the south side left steep and rugged as the glacier broke off chunks of rock as it passed.
A short loop trail leads up Beaverdam Hill where Little Agassiz Rock appears as a giant granite monolith silhouetted against the sky. It rests precariously on a small jagged stone, leaving an opening below.
A short distance away, other boulders lie perched on the edge of this glaciated upland. Below, in a small shrub swamp, rests thirty-foot-tall Big Agassiz Rock. How far it extends underground is unknown.
The trail to the site is a one-mile, moderate difficulty loop trail that passes both Big and Little Agassiz Rocks. Following long periods of rain the immediate area surrounding Big Agassiz Rock often floods.
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