Maine Geological Survey
Photo 8. Fine-grained mylonitic gneiss of the Ray Corner Mylonite Suite (rcm) cut by light gray veins of pseudotachylyte. Sudden, brittle failure at depth in the earth can generate intense frictional heating which causes melting along the fault surface. The melt then invades any open fractures and solidifies instantly, producing a rock similar to volcanic glass, called pseudotachylyte. This is an indicator of ancient faulting that probably produced earthquakes. Pavement outcrop approximately 700 meters west-northwest (N80W) of Ray Corner, Knox.
Project Name: Bedrock Geology Brooks West
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bedrock mapping; outcrop; STATEMAP
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