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Strata, structures, and enduring enigmas: A 125th Anniversary appraisal of Colorado Springs geology

By
Christine Siddoway
Christine Siddoway
Department of Geology, The Colorado College, Colorado Springs, Colorado 80903, USA
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Paul Myrow
Paul Myrow
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Elisa Fitz-Díaz
Elisa Fitz-Díaz
Department of Earth & Environmental Sciences, The University of Michigan, Ann Arbor, Michigan 48109, USA
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Published:
January 01, 2013

Abstract

Although the southern Front Range in Colorado Springs and Manitou Springs contains a near-complete record of Rocky Mountains geological evolution from Proterozoic to Present, there nevertheless are persistent geological problems that have eluded understanding for as much as 125 years. In keeping with the 2013 GSA Annual Meeting theme, “Celebrating Advances in Geoscience,” this field trip visits long-known elements of Front Range geology that merit reexamination within the context of new paleoenvironmental and geochronology data. Of note are: (1) the Great Unconformity and its chemically weathered substrate that correspond to a time of profound changes in global ocean chemistry; (2) lower Paleozoic strata that record sea-level fluctuations, attributable in part to regional tectonism; (3) an array of granite-hosted sandstone dikes, for which a new emplacement model is proposed; and (4) the Front Range monocline at Garden of the Gods Park, examined from the standpoint of its temporal evolution, newly bracketed by results of 40Ar/39Ar age analysis of illite generated by shear upon bedding-parallel faults.

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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
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Gregory S. Hancock
Gregory S. Hancock
Department of Geology College of William and Mary Williamsburg, Virginia 23187 USA
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Geological Society of America
Volume
33
ISBN electronic:
9780813756332
Publication date:
January 01, 2013

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