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The Geology of Alaska summarizes the onshore and offshore geology, tectonic evolution, and mineral resources of Alaska and the adjacent continental margin. The volume was prepared at a particularly appropriate time because it follows a period during which there has been an explosive increase in the amount, quality, and regional coverage of earth science data collected in Alaska and because the unifying concepts of plate tectonics and accretionary terranes have become available as a framework for interpreting the data. These new concepts have led to recognition that all of Alaska, except possibly for one area that underlies less than one percent of the state, consists of lithotectonic terranes (also referred to as “suspect” or “tectonostratigraphic” terranes) that have been added to, displaced from, and/or rotated to varying degrees relative to autochthonous parts of the continental margin (Silberling and others, this volume, Plate 3). Thus, a first-order division of the geology of Alaska can be made into (1) the small area of probable autochthonous rocks in east-central Alaska; (2) terranes underlain by known or probable pre-Late Proterozoic continental crust that were part of the North American miogeocline; and (3) terranes, flysch basins, and overlap assemblages that have either been added to, or built along, the south and west margins of the miogeoclinal assemblages in a belt 550 to 700 km wide (Fig. 1). Much of the geologic research in Alaska during the past 15 years has focused on defining these lithotectonic terranes on the basis of their biostratigraphic, magmatic, metamorphic, structural

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