Maine Geological Survey
Photo 10: An example of the Marsh Stream Mylonite (msm). This mylonite is derived from the Passagassawakeag Gneiss. Surviving porphyroclasts consist of feldspar and granite. Both feldspar and granite porphyroclasts are commonly asymmetric with a dextral sigmoidal shape. South end of Monroe Gravel Pit off Route 139, Monroe.
Project Name: Bedrock Geology Brooks East
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bedrock mapping; outcrop; STATEMAP
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