Skip to Main Content
Book Chapter

New views on late Paleozoic climate and tectonics in the Ancestral Rocky Mountains

By
Gerilyn S. Soreghan
Gerilyn S. Soreghan
School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma, USA
Search for other works by this author on:
Dustin E. Sweet
Dustin E. Sweet
Department of Geosciences, Texas Tech University, Lubbock, Texas, USA
Search for other works by this author on:
Published:
January 01, 2013

Abstract

Recent research in Pennsylvanian-Permian strata of the Fountain Formation adjacent to the Front Range uplift and the Cutler Formation adjacent to the Uncompahgre uplift (Colorado) has resulted in new hypotheses about the climate and tectonics of the Ancestral Rocky Mountains. The Fountain and the Cutler formations are iconic deposits; the thick and coarse-grained nature of these units has been cited for nearly a century as documenting the Ancestral Rockies. Long considered the products of alluvial fan deposition in warm climates, new data support the hypothesis of proglacial deposition for these units, and thus glaciation of the Ancestral Rocky highlands. This bears on our understanding of Late Paleozoic climate in western equatorial Pangaea, as well as global climate at this time. Furthermore, new mapping in the Uncompahgre region indicates substantial onlap and possible burial of Precambrian highlands by Permian strata. The argument for Permian subsidence of the uplift emanates from the hypothesis that Unaweep Canyon, which bisects the Uncompahgre Plateau (paleo Uncompahgre uplift) originated as a Permian paleolandscape. This trip will include visits to (1) the Fountain and Cutler formations to discuss and debate the sedimentologic origin(s) of these deposits, and (2) Unaweep Canyon to examine evidence for both a possible Paleozoic age and glacial origin for this canyon, and its late Cenozoic history as a former stream course of the ancestral Gunnison River.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

GSA Field Guide

Classic Concepts and New Directions: Exploring 125 Years of GSA Discoveries in the Rocky Mountain Region

Lon D. Abbott
Lon D. Abbott
Department of Geological Sciences University of Colorado Boulder, Colorado 80305 USA
Search for other works by this author on:
Gregory S. Hancock
Gregory S. Hancock
Department of Geology College of William and Mary Williamsburg, Virginia 23187 USA
Search for other works by this author on:
Geological Society of America
Volume
33
ISBN electronic:
9780813756332
Publication date:
January 01, 2013

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now