A map showing the distribution of Pennsylvanian-Permian metamorphism in southern New England shows that the center of metamorphism is located substantially south and east of Middle Devonian (Acadian) high-grade metamorphism; this suggests that the Permian disturbance in southern New England is not related to delayed post-Acadian uplift. The map is based on existing data within the Pennsylvania basins and on a combination of published microstructures and apparent mineral ages in the surrounding rocks. The distribution of metamorphism is, however, apparently related to major tectonic boundaries that were active during the late Paleozoic and suggests that it may be the result of terrane accretion during the late Paleozoic.

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