Abstract
The term hinterland refers to the central core of a collisional mountain belt where crystalline rocks dominate but where volcanic and sedimentary rocks are also present. In this chapter, we look at rocks and landscape that form the central core of the Appalachian and Cordilleran Mountains. These areas include the Appalachian Blue Ridge, Piedmont Plateau, and New England Highlands, and the Cordilleran northern Rockies and North Cascades. The Appalachians are considered an ancient mountain belt; however, present-day topography may be less than 15 million years old due to thermal isostatic uplift. Much of the highland region results from the presence of resistant crystalline rock. The North Cascades have undergone recent tectonic uplift in a wet climate resulting in some of the steepest terrain in the United States.
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