Abstract
Chapter 21 describes an idealized orogenic mountain belt and shows where each feature is present in the Appalachian and Cordilleran mountains. It begins with a description of the general character of orogenic systems with particular reference to the variation in rock type and structure across an orogenic belt. It then uses these variations to define tectonic style, which is the overall style of deformation and can be described as orogenic, epeirogenic, or post-orogenic, and rock succession, which is a stack of rocks, whether sedimentary, crystalline, volcanic, or some combination, that are related to each other by their age, thickness, and geologic interpretation. Rock succession and tectonic style are combined to subdivide the United States into six tectonic provinces. This chapter also clearly defines the foreland and hinterland regions of mountain belts.
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