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Carbonate deposition dominated the Franklinian miogeocline from Late Cambrian until earliest Middle Devonian. Following a transgression in early Eifelian (within the costatus-costatus conodont Zone), quartzose clastics replaced carbonates as the dominant sediment type and, from that time until Early Carboniferous, clastic sedimentation was widespread across the Franklinian miogeocline. During this interval an enormous clastic wedge prograded southwestward, heralding the advance of Ellesmerian deformation.

Middle-Upper Devonian clastic sediments are widely preserved and are most widespread in the western Arctic, where they occur over much of Bathurst, Melville, Prince Patrick and Banks islands (Fig. 10.1). In the eastern Arctic the deposits occur mainly in a broad synclinorium which stretches from central Ellesmere Island to eastern Grinnell Peninsula. Isolated occurrences are present on northern Ellesmere Island in the Yelverton Pass region and in Tertiary grabens on Cornwallis Island (Fig. 10.1, Fig. 4 [in pocket]). Forty-two wells have penetrated the strata and numerous surface sections are described in the literature (Fig. 10.1, Fig. 1 [in pocket]). The maximum preserved thickness of the clastic wedge is about 4000 m, although thermal maturation levels of strata within and directly below the wedge suggest that original thicknesses may have been nearly twice this figure in some areas.

Regional mapping studies carried out by the Geological Survey of Canada in the 1950s and 1960s established a general stratigraphic framework for these clastic sediments (McLaren, 1963; Thorsteinsson and Tozer, 1962; Tozer and Thorsteinsson, 1964; Kerr, 1974). Embry and Klovan (1976) reviewed all previous work up to 1975 and presented

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