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Upper Proterozoic rocks of the Avalon zone constitute much of the eastern basement of the New England Appalachians and have played a major role in its evolution. Avalonian rocks in southeastern New England are a composite of at least two distinct assemblages definable as terranes, the Esmond–Dedham and the Hope Valley. These terranes appear to have had differing interactions with rocks derived from the North American continent, with major tectonic modifications and/or transport occurring in late Paleozoic time. The Esmond–Dedham terrane lacks any clear previous relationships to other rocks in the region and probably was newly accreted during late Paleozoic...

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