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were both formed as part of the uplift. Approximately 35 MYA, stresses in the continental plate in the center of the uplift caused the center to collapse, forming the upper
Arkansas River graben. This is a trough between the Sawatch and Mosquito Range that is part of the larger
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Kellogg, Karl S (May 1999). "Neogene basins of the northern Rio Grande rift: partitioning and asymmetry inherited from
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