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Gettysburg National Military Park & Eisenhower National Historic Site

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Gettysburg National Military Park & Eisenhower National Historic Site National Park Service U.S. Department of the Interior Natural Resource Program Center Gettysburg National Military Park & Eisenhower National Historic Site Geologic Resources Inventory Report Natural Resource Report NPS/NRPC/GRD/NRR—2009/083 THIS PAGE: North Carolina State Monument (NPS Photo) ON THE COVER: Gettysburg NMP, looking toward Cemetery Ridge Cover photo by Bill Dowling, courtesy of the Gettysburg Foundation Gettysburg National Military Park and Eisenhower National Historic Site Geologic Resources Inventory Report Natural Resource Report NPS/NRPC/GRD/NRR—2009/083 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. Gettysburg National Military Park and Eisenhower National Historic Site Geologic Resources Inventory Report. Natural Resource Report NPS/NRPC/ GRD/NRR—2009/083. National Park Service, Denver, Colorado. ii NPS D-188, March 2009 Contents Figures .......................................................................................................................... iv Executive Summary ...................................................................................................... 1 Introduction ................................................................................................................... 2 Purpose of the Geologic Resources Inventory ........................................................................................................... 2 Geologic Setting ......................................................................................................................................................... 2 Geologic Issues ............................................................................................................. 9 Introduction ................................................................................................................................................................. 9 Surrounding Development .......................................................................................................................................... 9 Geologic Hazards ..................................................................................................................................................... 10 Disturbed Lands and Mining ..................................................................................................................................... 11 Erosion, Slope Processes, and Flooding .................................................................................................................. 12 Paleontological Resources ....................................................................................................................................... 12 Geologic Features and Processes ............................................................................. 21 Gettysburg Formation ............................................................................................................................................... 21 Geology and Connections with History ..................................................................................................................... 21 Devils Den and Little Round Top .............................................................................................................................. 24 Frost Wedging .......................................................................................................................................................... 24 Map Unit Properties .................................................................................................... 31 Map Unit Properties Table ........................................................................................................................................ 32 Geologic History.......................................................................................................... 35 Glossary ....................................................................................................................... 42 References ................................................................................................................... 45 Appendix A: Geologic Map Graphic .......................................................................... 48 Attachment 1: Geologic Resources Inventory Products CD GETT-EISE Geologic Resources Inventory Report iii Figures Figure 1. Physiographic Provinces of Pennsylvania. ...................................................................................................... 4 Figure 2. Mesozoic Rift Basins ....................................................................................................................................... 4 Figure 3. Map of Gettysburg National Military park and Eisenhower National Historic Site ........................................... 4 Figure 4. Rendering of the Eisenhower Farm ................................................................................................................ 7 Figure 5. Eisenhower National Historic Site view to the southwest ................................................................................ 8 Figure 6. Aerial View of Gettysburg National Military Park and Surrounding Developments ........................................ 14 Figure 7. Detailed Aerial View of Gettysburg National Military Park ............................................................................. 14 Figure 8. Plum Run Traversing Gettysburg Battlefield ................................................................................................. 15 Figure 9. Little Round Top in Winter. ............................................................................................................................ 16 Figure 10. Dinosaur Tracks .......................................................................................................................................... 17 Figure 11. Dinosaur Tracks .......................................................................................................................................... 18 Figure 12. Dinosaur Tracks from the Bridge on South Confederate Avenue ............................................................... 18 Figure 13. Exposed Sedimentary Strata ...................................................................................................................... 19 Figure 14. Exposed Sedimentary Strata ...................................................................................................................... 19 Figure 15. Peace Memorial at Gettysburg National Military Park ................................................................................. 20 Figure 16. Fossil Remains ........................................................................................................................................... 20 Figure 17. Gettysburg Campaign ................................................................................................................................. 25 Figure 18. Gettysburg Battlefield .................................................................................................................................. 26 Figure 19. Generalized Cross Section across Gettysburg Battlefield ........................................................................... 26 Figure
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