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Folds and faults along the northeastern flank of the Front Range were examined using NASA (U.S. National Aeronautics and Space Administration) high-altitude photographs, published geologic maps, and new field studies. Detailed analysis of each structure reveals that block faulting of brittle basement is the dominant tectonic feature within the area. Twenty-three of the twenty-six folds were created by passive draping of sedimentary rocks over the edges of basement blocks. The other three folds were caused by local compression generated by anomalously tilted blocks.

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