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Meguma, the most outboard northern Appalachian terrane, is characterized by Upper Neoproterozoic to Lower Ordovician turbiditic rocks that have an exposed thickness of more than 11 km. As a result of geological mapping, combined with petrological studies, the stratigraphy of these rocks has been redefined. The traditional twofold division into the meta-sandstone–dominated Goldenville Group and the overlying slate-dominated Halifax Group is retained, but the Chebogue Point shear zone divides these groups into western and southern stratigraphic packages containing different formations. In both packages, psammitic rocks are dominantly feldspathic wacke, and they have mineralogical compositions indicative of deposition in an active...

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