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Stratigraphy and structure of the Laurentian rifted margin in the northern Appalachians: A low-angle detachment rift system

¹ Department of Earth and Environmental Sciences, University of Kentucky, Lexington, Kentucky 40506-0053, USA
² Geological Survey of Canada, Centre Géoscieique de Québec, 490 de la Couronne, Quebec City, Quebec G1K 9A9, Canada

The Neoproterozoic–Early Cambrian rifted margin of eastern Laurentia is framed by promontories and embayments defined by northeast-trending rifts offset by northwest-trending transforms. A regional first-order synthesis of the available stratigraphic data in the northern Appalachians reveals significant along-strike variations in the thickness, composition, age, and facies of synrift and early postrift stratigraphy. These variations are consistent with models for low-angle detachment rift systems and allow for resolution of regional structures specific to low-angle detachments, including upper-plate margins, lower-plate margins, and transform faults that bound zones of oppositely dipping low-angle detachments.