UMass Sesquicentennial

Mylonite in Northborough

A closeup of a microcline porphyroclast withinin a thin mylonite zone in Northborough.

The mylonite zone in question is one of many branches of the now dormant, but long-active, Clinton Newbury Fault Zone that transects Massachusetts from Worcester to Newburyport-- just one of the several ancient fault zones that play a significant role in the geologic history of the Commonwealth.


The MA Geological Survey
Department of Geosciences
269 Morrill Science Center
University of Massachusetts
611 North Pleasant Street
Amherst, MA 01003-9297

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Ph: (413) 545-4814
Fax: (413) 545-1200

stategeologist at geo dot umass dot edu

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