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Virginia Department of Mines, Minerals and Energy Division of Mineral Resources

SOUTHEAST-DIRECTED BACKTHRUSTING AND CRUSTAL THICKENING IN THE MASSANUTTEN SYNCLINORIUM: ROCKINGHAM AND PAGE COUNTIES, VIRGINIA. Matthew HELLER, Steven WHITMEYER, Christopher HOLLAND, David ARNETTE, Mark CARTER, and Lorrie COINER. Virginia Department of Mines, Minerals and Energy

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Virginia Department of Mines, Minerals and Energy Division of Mineral Resources

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  1. SOUTHEAST-DIRECTED BACKTHRUSTING AND CRUSTAL THICKENING IN THE MASSANUTTEN SYNCLINORIUM: ROCKINGHAM AND PAGE COUNTIES, VIRGINIA Matthew HELLER, Steven WHITMEYER, Christopher HOLLAND, David ARNETTE, Mark CARTER, and Lorrie COINER Virginia Department of Mines, Minerals and Energy Division of Mineral Resources James Madison University Department of Geology and Environmental Sciences

  2. Laurentian Realm Axial Realm Piedmont Goochland Peri-Gondwanan Realm Carolina

  3. Charlottesville and Front Royal 30- x 60 Minute Quadrangles West of Blue Ridge (Rader and Gathright, 2001) 10miles

  4. Charlottesville and Front Royal 30- x 60 Minute Quadrangles West of Blue Ridge (Rader and Gathright, 2001) 10miles

  5. Charlottesville and Front Royal 30- x 60 Minute Quadrangles West of Blue Ridge (Rader and Gathright, 2001) 10miles

  6. Charlottesville and Front Royal 30- x 60 Minute Quadrangles West of Blue Ridge (Rader and Gathright, 2001) 10miles

  7. Charlottesville and Front Royal 30- x 60 Minute Quadrangles West of Blue Ridge (Rader and Gathright, 2001) 10miles

  8. Charlottesville and Front Royal 30- x 60 Minute Quadrangles West of Blue Ridge (Rader and Gathright, 2001) 10miles

  9. Charlottesville and Front Royal 30- x 60 Minute Quadrangles West of Blue Ridge (Rader and Gathright, 2001) 10miles

  10. Devonian shale Siluro-Devonian silt / sandstone Silurian sandstone Ordivician shale / sandstone Cambro-Ordivician carbonate Brent (1960) and Allen (1966) 1 1 2 2 5miles

  11. Rader and Gathright (2001) Devonian shale Siluro-Devonian silt / sandstone Silurian sandstone Ordivician shale / sandstone Cambro-Ordivician carbonate 1 1 5miles

  12. Northwest portion of Elkton West 7.5’ quadrangle 2 miles

  13. NW SE

  14. Northwest portion of Elkton West 7.5’ quadrangle 2 1 1 2 miles

  15. NE Page Valley Laird Knob 2 3 Page Valley Laird Knob

  16. Looking NE Page Valley Laird Knob

  17. SW Laird Knob 1 2nd 1st Laird Knob 1 2nd 1st

  18. Bedding Overturned Bedding n=64 Cleavage n=17 n=45 2 miles

  19. Bedding Overturned Bedding n=64 Cleavage n=17 n=57 2 miles

  20. SE NW Looking NE

  21. Millboro / Needmore Wills Creek / Bloomsburg Massanutten Upper Martinsburg Lower Martinsburg Edinburg Lincolnshire / New Market Beekmantown Conococheague Southeast portion of Tenth Legion 7.5’ quadrangle 2 miles

  22. NW SE

  23. CONCLUSIONS • 1:24,000-scale mapping confirms the existence of a significant backthrust in Page and Rockingham counties • Displacement along this fault may be up to 1 km • Minor structures suggest additional displacement within the footwall • Backthrusting clearly post-dates development of northwest vergent folds and locally changes the vergence of the Massanutten Syncline • Crustal thickening due to backthrusting may be a factor in the present day relief of the Massanutten range

  24. ACKNOWLEDGEMENT Mapping for this project was completed under the STATEMAP Program with assistance from the U.S. Geological Survey

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