Alluvial-Colluvial

OPEN-FILE REPORT 06-10
Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado
Description of Map Units, Structural Geology, Mineral and Water Resources, and Geologic Hazards
by James R. Shannon1 and James P. McCalpin2
1 2
Colorado School of Mines, Golden, CO GEO-HAZ Consulting, Crestone, CO
This mapping project was funded jointly by the Colorado Geological Survey and the U.S. Geological Survey through the National Geologic Mapping Program under STATEMAP Agreement No. 05HQAG0064.
Bill Owens, Governor, State of Colorado Vince Matthews, State Geologist and Division Director, Colorado Geological Survey Denver, Colorado 2006
FOREWORD The Colorado Geological Survey is pleased to present Open File Report 06-10, Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado. Its purpose is to describe the geologic setting and mineral resource potential of this 7.5-minute quadrangle. Field work for this project was conducted during the summer of 2005. This mapping project was funded jointly by the U.S. Geological Survey through the STATEMAP component of the National Cooperative Geologic Mapping Program which is authorized by the National Geologic Mapping Act of 1997, Agreement No. 05HQAG0064, and the Colorado Geological Survey using the Colorado Department of Natural Resources Severance Tax Operational Funds. The CGS matching funds come from the severance tax paid on the production of natural gas, oil, coal, and metals. Vince Matthews State Geologist and Division Director
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TABLE OF CONTENTS
Introduction……………………………………………………………………… 7 Location and Access…………………………………………………………….. 7 Geologic and Tectonic Setting…………………………………………………... 12 Previous Studies…………………………………………………………………. 30 Methods………………………………………………………………………….. 34 Acknowledgments……………………………………………………………….. 37 Description of Map Units………………………………………………………... 38 Surficial Deposits………………………………………………………………... 38 Human-Made Deposits…………………………………………………………... 38 Glacial Deposits…………………………………………………………………. 38 Periglacial Deposits……………………………………………………………... 43 Alluvial Deposits………………………………………………………………... 46 Colluvial Deposits………………………………………………………………. 54 Alluvial-Colluvial Deposits…………………………………………………….. 56 Tertiary Rocks and Deposits……………………………………………………. 59 Tertiary Igneous Rocks…………………………………………………………. 73 Paleozoic Sedimentary Rocks…………………………………………………... 108 Proterozoic Rocks………………………………………………………………. 113 Structural Geology…………………………………………………………….... 150 Discussion………………………………………………………………………. 168 Geologic Hazards……………………………………………………………….. 173 Economic Geology……………………………………………………………… 180 Water Resources………………………………………………………………... 195 References………………………………………………………………………. 198 Appendix………………………………………………………………….. CD-ROM

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