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Maine Geological Survey

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Photo 7. Porphyroclastic mylonite (my). The tiny white feldspar grains, called porphyroclasts, are remnants of larger grains that have been partly destroyed by ductile shearing of the rock during intense deformation. Most of the minerals in the rock have been reduced to microscopic bits, entrained in the intense foliation that trends left to right in this photo. Mylonite forms at depth, in rocks that are at elevated temperature and pressure in the earth. Pavement outcrop approximately 300 meters northwest (N40W) of Styles Cemetery, Jackson.
Project Name: Bedrock Geology Brooks West

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Credit must be given to the photographer and the Maine Geological Survey when this photo is displayed, reproduced, distributed and/or used in derivative works.


bedrock mapping; outcrop; STATEMAP


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No Copyright - United States. URI:
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