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In page Mont Shefford:
"Mount Shefford was formed some 125 million years ago during an underground intrusion of magma. This magma did not reach the earth's surface and remained in a deep freeze. The mountain appeared following the erosion of nearby sedimentary rocks by glaciers. The sedimentary rock was more fragile than the metamorphic rock formed by the contact of the magma and the surrounding sedimentary rock.
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