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Cenozoic Tectonic History of the Great Plains Contrasted with that of the Southern Rocky Mountains: A Synthesis

The Cenozoic tectonic history of the Southern Rocky Mountains has been interpreted in some detail, but the corresponding history of the Great Plains has not received similar attention. This evaluation of significant datum levels in the Great Plains at different times during the Cenozoic indicates that during the Laramide, when the mountains possibly were uplifted more than six thousand meters, the Great Plains remained tectonically stable and was only slightly depressed locally by isostatic response. Post-early Oligocene (post-Wall Mountain Tuff) uplift of both the Great Plains and the Southern Rocky Mountains was of the same broad order of magnitude, and most of this uplift occurred after the end of deposition of the Ogallala Formation, 5 to 6 million years ago. Lack of tectonic effects in the Great Plains during Laramide time suggests that Laramide uplift of the mountains was the result of vertical rather than horizontal or compressional forces.