The Colorado front range: anatomy of a Laramide uplift

Karl S. Kellogg; Bruce Bryant; John C. Reed

doi:10.1130/0-8137-0005-1.89

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The Colorado front range: anatomy of a Laramide uplift

Karl S. Kellogg·Bruce Bryant·John C. Reed

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Abstract

Along a transect across the Front Range from Denver to the Blue River valley near Dillon, the trip explores the geologic framework and Laramide (Late Cretaceous to early Eocene) uplift history of this basement-cored mountain range. Specific items for discussion at various stops are (1) the sedimentary and structural record along the upturned eastern margin of the range, which contains several discontinuous, east-directed reverse faults; (2) the western structural margin of the range, which contains a minimum of 9 km of thrust overhang and is significantly different in structural style from the eastern margin; (3) mid- to late-Tertiary modifications to the western margin of the range from extensional faulting along the northern Rio Grande rift trend; (4) the thermal and uplift history of the range as revealed by apatite fission track analysis; (5) the Proterozoic basement of the range, including the significance of northeast-trending shear zones; and (6) the geologic setting of the Colorado mineral belt, formed during Laramide and mid-Tertiary igneous activity.

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Source-reported bounding extent: 36.99377838872517° to 41.0130657870063° latitude; -109.061279296875° to -102.041015625° longitude. This indicates report coverage, not an exact sampling location. View area on OpenStreetMap.

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Karl S. Kellogg, Bruce Bryant, John C. Reed. 2004. The Colorado front range: anatomy of a Laramide uplift. https://doi.org/10.1130/0-8137-0005-1.89

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