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Geologic Map of the Shenandoah National Park Region, Virginia

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Geologic Map of the Shenandoah National Park Region, Virginia Prepared in cooperation with the National Park Service Geologic Map of the Shenandoah National Park Region, Virginia By Scott Southworth, John N. Aleinikoff, Christopher M. Bailey, William C. Burton, E.A. Crider, Paul C. Hackley, Joseph P. Smoot, and Richard P. Tollo Open-File Report 2009–1153 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Suzette M. Kimball, Acting Director U.S. Geological Survey, Reston, Virginia 2009 Revised and reprinted: 2009 For product and ordering information: World Wide Web: http://www.usgs.gov/pubprod Telephone: 1-888-ASK-USGS For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: http://www.usgs.gov Telephone: 1-888-ASK-USGS Suggested citation: Southworth, Scott, Aleinikoff, J.N., Bailey, C.M., Burton, W.C., Crider, E.A., Hackley, P.C., Smoot, J.P., and Tollo, R.P., 2009, Geologic map of the Shenandoah National Park region Virginia: U.S. Geological Survey Open-File Report 2009–1153, 96 p., 1 plate, scale 1:100,000. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report. ii Contents Introduction .................................................................................................................................................................... 1 Previous Studies ............................................................................................................................................................ 1 General Geologic Setting and Physiography ................................................................................................................. 2 General Geologic History ............................................................................................................................................... 2 Methodology .................................................................................................................................................................. 3 Blue Ridge Province ...................................................................................................................................................... 4 Mesoproterozoic Rocks.............................................................................................................................................. 4 Introduction ............................................................................................................................................................ 4 Previous Work ........................................................................................................................................................ 4 Terminology............................................................................................................................................................ 5 Lithologies .............................................................................................................................................................. 5 Groups ................................................................................................................................................................... 6 Introduction ......................................................................................................................................................... 6 Group 1 ............................................................................................................................................................... 6 Leucogranite Gneiss ....................................................................................................................................... 6 Foliated, Garnetiferous, Porphyroblastic Monzogranite .................................................................................. 7 Orthopyroxene Granodiorite Gneiss................................................................................................................ 7 Orthopyroxene Syenogranite and Monzogranite Gneiss ................................................................................. 7 Orthopyroxene Quartz Diorite Gneiss ............................................................................................................. 7 Granodiorite Gneiss ........................................................................................................................................ 8 Megacrystic Orthopyroxene Syenogranite-Monzogranite Gneiss ................................................................... 8 Orthopyroxene Monzogranite-Quartz Monzodiorite Gneiss ............................................................................ 8 Lineated Leucogranite Gneiss ........................................................................................................................ 8 Flint Hill Gneiss ............................................................................................................................................... 9 Group 2 ............................................................................................................................................................... 9 Orthopyroxene Granite Monzogranite ............................................................................................................. 9 Group 3 ............................................................................................................................................................... 9 Porphyroclastic Metagranitoid ......................................................................................................................... 9 Old Rag Granite .............................................................................................................................................10 Crozet Granite ................................................................................................................................................10 Megacrystic Biotite Monzogranite ..................................................................................................................11 Megacrystic Quartz Monzonite .......................................................................................................................11 Orthopyroxene Monzogranite-Quartz Monzodiorite .......................................................................................11 Biotite Monzogranite-Quartz Monzodiorite .....................................................................................................11 Neoproterozoic rocks ................................................................................................................................................12 Introduction ...........................................................................................................................................................12 Garnet-Graphite Paragneiss..................................................................................................................................12 Robertson River Igneous Suite ..............................................................................................................................13 Mechum River Formation ......................................................................................................................................14 Swift Run Formation ..............................................................................................................................................15 Introduction ........................................................................................................................................................15 Previous Studies ................................................................................................................................................15 Stratigraphic Relationships Within Shenandoah National Park ..........................................................................16 Metadiabase Dikes ................................................................................................................................................18 Catoctin Formation ................................................................................................................................................18 Introduction ........................................................................................................................................................18 iii Stratigraphy Within Shenandoah National Park .................................................................................................19 Depositional Setting and Thickness ...................................................................................................................21 Age ....................................................................................................................................................................21 Regional Relations .............................................................................................................................................21 Paleozoic Sedimentary Rocks ..................................................................................................................................22
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