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12: The 2016 Kirk Bryan field trip: Quaternary landslides, fluvial terraces, and recent geomorphic events along the Colorado Front Range

By
Melissa A. Foster
Melissa A. Foster
Bureau of Reclamation, P. O. Box 25007, Denver Federal Center, Denver, Colorado 80225, USA
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Robert S. Anderson
Robert S. Anderson
Institute of Arctic and Alpine Research, UCB 450, University of Colorado, Boulder, Colorado 80309, USA, and Department of Geological Sciences, UCB 399, University of Colorado, Boulder, Colorado 80309, USA
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Paul R. Rindfleisch
Paul R. Rindfleisch
Natural Resources Conservation Service, P. O. Box 25426, Denver Federal Center, Denver, Colorado 80225, USA
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Peter W. Birkeland
Peter W. Birkeland
Department of Geological Sciences, UCB 399, University of Colorado, Boulder, Colorado 80309, USA
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Joanna R. Redwine
Joanna R. Redwine
Bureau of Reclamation, P. O. Box 25007, Denver Federal Center, Denver, Colorado 80225, USA
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John Pitlick
John Pitlick
Department of Geography, UCB 260, University of Colorado, Boulder, Colorado 80309, USA
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Rachel C. Glade
Rachel C. Glade
Institute of Arctic and Alpine Research, UCB 450, University of Colorado, Boulder, Colorado 80309, USA, and Department of Geological Sciences, UCB 399, University of Colorado, Boulder, Colorado 80309, USA
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Published:
January 01, 2016

Abstract

During the Quaternary, large deep-seated landslides were initiated along the eastern flank of the Colorado Front Range, and rivers cut and deposited large strath terraces along the western High Plains. These are the most extensive and prominent geomorphic features in the landscape. On this field trip, we will explore the Quaternary evolution of these Front Range features, in addition to viewing the smaller erosion scars and deposits associated with a 1000-yr precipitation event in 2013. We begin the trip near Golden, Colorado, where we will view the most extensive Quaternary strath terrace (Rocky Flats) preserved in the Denver Basin. We then head to Boulder, Colorado, to view the contrast between recent debris flows and deep-seated Quaternary landslides. Near Lefthand Creek, north of Boulder, we will view a suite of strath terraces and discuss the cosmogenic radionuclide dates that indicate both rapid incision and a new version of the terraces ages. Throughout the day, we will focus on the geomorphic work done by rare events, as well as discuss numeric and relative dating of Quaternary terraces and landslides.

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Contents

GSA Field Guide

Unfolding the Geology of the West

Stephen M. Keller
Stephen M. Keller
Colorado Geological Survey Colorado School of Mines 1801 19th Street Golden, Colorado 80401, USA
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Matthew L. Morgan
Matthew L. Morgan
Colorado Geological Survey Colorado School of Mines 1801 19th Street Golden, Colorado 80401, USA
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Geological Society of America
Volume
44
ISBN print:
9780813756448
Publication date:
January 01, 2016

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