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The most important latest Mesozoic and Cenozoic, postaccretionary geologic features of southeastern Alaska are those related to the magmatic activity that affected a large part of the region and to the resultant metamorphism and deformation. The metamorphic history is discussed elsewhere in this volume (Dusel-Bacon, this volume), and the magmatic activity is a continuation of the late Mesozoic activity discussed by Miller (this volume). Postaccretionary geologic history starts with the accumulation of the Gravina belt overlap assemblage of rocks in Late Jurassic and Early Cretaceous time (Berg and others, 1972). The locally voluminous volcanic rocks within that assemblage are...

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