About the Cover
Looking southwest into the core of a north vergent Paleocene fold and thrust in the eastern Shublik Mountains, northeast Brooks Range, Alaska. Photo by Francis Macdonald. Folded strata consists primarily of limestones of the Mississipian Lisborne Group, which rest unconformably on the Cambro-Ordovician Nanook Limestone and the Neoproterozoic Katakturuk Dolomite. See related article by Macdonald et al. (v. 121, no. 3/4, p. 448-473.)
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