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Prince William Forest Park Geologic Resources Inventory Report

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Prince William Forest Park Geologic Resources Inventory Report National Park Service U.S. Department of the Interior Natural Resource Program Center Prince William Forest Park Geologic Resources Inventory Report Natural Resource Report NPS/NRPC/GRD/NRR—2009/086 THIS PAGE: South Fork Quantico Creek ON THE COVER: Bridge over South Fork Quantico Creek NPS Photos Prince William Forest Park Geologic Resources Inventory Report Natural Resource Report NPS/NRPC/GRD/NRR—2009/086 Geologic Resources Division Natural Resource Program Center P.O. Box 25287 Denver, Colorado 80225 March 2009 U.S. Department of the Interior National Park Service Natural Resource Program Center Denver, Colorado The Natural Resource Publication series addresses natural resource topics that are of interest and applicability to a broad readership in the National Park Service and to others in the management of natural resources, including the scientific community, the public, and the NPS conservation and environmental constituencies. Manuscripts are peer-reviewed to ensure that the information is scientifically credible, technically accurate, appropriately written for the intended audience, and is designed and published in a professional manner. Natural Resource Reports are the designated medium for disseminating high priority, current natural resource management information with managerial application. The series targets a general, diverse audience, and may contain NPS policy considerations or address sensitive issues of management applicability. Examples of the diverse array of reports published in this series include vital signs monitoring plans; "how to" resource management papers; proceedings of resource management workshops or conferences; annual reports of resource programs or divisions of the Natural Resource Program Center; resource action plans; fact sheets; and regularly-published newsletters. Views, statements, findings, conclusions, recommendations and data in this report are solely those of the author(s) and do not necessarily reflect views and policies of the U.S. Department of the Interior, National Park Service. Mention of trade names or commercial products does not constitute endorsement or recommendation for use by the National Park Service. Printed copies of reports in these series may be produced in a limited quantity and they are only available as long as the supply lasts. This report is also available online from the Geologic Resources Inventory website (http://www.nature.nps.gov/geology/inventory/ gre_publications.cfm) and the Natural Resource Publication Management website (http:// www.nature.nps.gov/publications/NRPM/index.cfm) or by sending a request to the address on the back cover. Please cite this publication as: Thornberry-Ehrlich, T. 2009. Prince William Forest Park Geologic Resources Inventory Report. Natural Resource Report NPS/NRPC/GRD/NRR—2009/086. National Park Service, Denver, Colorado. ii NPS D-54, March 2009 Contents Figures .......................................................................................................................... iv Executive Summary ...................................................................................................... 1 Introduction ................................................................................................................... 2 Purpose of the Geologic Resources Inventory ........................................................................................................... 2 History of Prince William Forest Park ......................................................................................................................... 2 Geologic Setting ......................................................................................................................................................... 2 Geologic Issues ............................................................................................................. 6 Mining-Related Issues ................................................................................................................................................ 6 Geology and Biodiversity ............................................................................................................................................ 6 Recreational Demands ............................................................................................................................................... 7 Water Issues ............................................................................................................................................................... 7 Erosion and Slope Processes..................................................................................................................................... 8 Paleontology ............................................................................................................................................................... 8 Geologic Education and Research ............................................................................................................................. 9 Geologic Features and Processes ............................................................................. 14 Geology and the Landscape ..................................................................................................................................... 14 Regional Structure .................................................................................................................................................... 14 Quantico Falls ........................................................................................................................................................... 15 Map Unit Properties .................................................................................................... 19 Map Unit Properties Table ........................................................................................................................................ 21 Geologic History.......................................................................................................... 23 Glossary ....................................................................................................................... 30 References ................................................................................................................... 34 Appendix A: Geologic Map Graphic............................................................................. 36 Appendix B: Scoping Summary ................................................................................. 39 Attachment 1: Geologic Resources Inventory CD PRWI Geologic Resources Inventory Report iii Figures Figure 1.Map of Prince William Forest Park ................................................................................................................... 4 Figure 2. Physiographic Province Map of Virginia. ......................................................................................................... 5 Figure 3. Erosion from foot traffic along South Valley Trail .......................................................................................... 10 Figure 4. A buttress along South Fork Quantico Creek. ............................................................................................... 11 Figure 5. Top-down view of a gabion along shoreline of South Fork Quantico Creek .................................................. 12 Figure 6. Undercut slope along banks of South Fork Quantico Creek ......................................................................... 12 Figure 7. Gullying along South Valley Trail. ................................................................................................................. 13 Figure 8. Diagram showing effects of slope processes and erosion along Quantico Creek ......................................... 13 Figure 9. Map of Prince William County ....................................................................................................................... 16 Figure 10. Generalized cross section through Prince William County .......................................................................... 17 Figure 11. Quantico Falls ............................................................................................................................................. 17 Figure 12. Steeply dipping gneissic beds underlying Quantico Falls. ........................................................................... 18 Figure 13: Geologic time scale ..................................................................................................................................... 26 Figures 14-16. Geologic evolution of the Appalachian Mountains in the Prince William Forest Park area ............. 27-29 iv NPS Geologic Resources Division Executive Summary This report accompanies the digital geologic map for Prince William Forest Park in Virginia, which the Geologic Resources Division produced in collaboration with its partners. It contains information relevant to resource management and scientific research. This document incorporates preexisting geologic information and does not include new data or additional fieldwork. Prince William Forest Park begins with the geology, that further impacts of visitors are only just beginning to be is, with the processes that formed the present-day measured and alleviated. Researchers are striving to environments and scenery. Understanding the geologic better understand all these impacts on the environment. resources is relevant
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