Detailed Sections from Auger Holes in the Emporia 1:100,000 · PDF file...

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  • Detailed Sections from Auger Holes in the Emporia 1:100,000-Scale Quadrangle, North Carolina and Virginia

    By Robert E. Weems, J. Stephen Schindler, and William C. Lewis

    Open-File Report 2010–1121

    U.S. Department of the Interior U.S. Geological Survey

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    U.S. Department of the Interior KEN SALAZAR, Secretary

    U.S. Geological Survey Marcia K. McNutt, Director

    U.S. Geological Survey, Reston, Virginia: 2010

    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: Weems, R.E., Schindler, J.S., and Lewis, W.C., 2010, Detailed sections from auger holes in the Emporia 1:100,000-scale quadrangle, North Carolina and Virginia: U.S. Geological Survey Open-File Report 2010– 1121, 288 p.

    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.

    Cover: Sediments from the upper part of the Yorktown Formation (Pliocene) at the Old Hickory Heavy Mineral Deposit, located west of Stony Creek, Va. This exposure no longer exists because it has been reclaimed. Natural outcrops of coastal plain sediments are uncommon in the Emporia quadrangle; hence the need for borehole data, as published in this report. Photograph by J. Stephen Schindler, U.S. Geological Survey.

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    Contents Introduction .................................................................................................................................................................... 1 Methods ......................................................................................................................................................................... 1 Stratigraphy ................................................................................................................................................................... 2 Structural Geology ......................................................................................................................................................... 3 Hydrogeology ................................................................................................................................................................. 3 Acknowledgments .......................................................................................................................................................... 4 References Cited ........................................................................................................................................................... 4 Locality Descriptions and Detailed Lithologic Logs ...................................................................................................... 13

    Adams Grove Quadrangle........................................................................................................................................ 13 Barley Quadrangle ................................................................................................................................................... 23 Boykins Quadrangle ................................................................................................................................................. 25 Capron Quadrangle .................................................................................................................................................. 31 Cherry Hill Quadrangle ............................................................................................................................................. 37 Claresville Quadrangle ............................................................................................................................................. 77 Courtland Quadrangle .............................................................................................................................................. 83 Drewryville Quadrangle ............................................................................................................................................ 87 Emporia Quadrangle ................................................................................................................................................ 89 Jarratt Quadrangle ................................................................................................................................................... 99 Littleton Quadrangle ............................................................................................................................................... 109 Manry Quadrangle ................................................................................................................................................. 136 Margarettsville Quadrangle .................................................................................................................................... 156 Purdy Quadrangle .................................................................................................................................................. 167 Sebrell Quadrangle ................................................................................................................................................ 174 Skippers Quadrangle ............................................................................................................................................. 178 Stony Creek Quadrangle ........................................................................................................................................ 202 Sunbeam Quadrangle ............................................................................................................................................ 261 Sussex Quadrangle ................................................................................................................................................ 265 Yale Quadrangle .................................................................................................................................................... 284

    Supplementary Basement Data ................................................................................................................................. 288

    Figures 1. Map of the Emporia 1:100,000-scale quadrangle, showing area underlain by Atlantic Coastal Plain

    sediments, names and locations of constituent 1:24,000-scale quadrangles, and county names and boundaries ........................................................................................................................................................ 6

    2. Structure contour map of the base of the coastal plain in the Emporia 1:100,000-scale quadrangle, showing areas where basement is overlain by Cretaceous sediments and middle Miocene or younger sediments ......................................................................................................................................................... 7

    3. Faults and subsurface updip limits of Yorktown Formation and older units ...................................................... 8 4. Structure contour map of the base of the surficial aquifer in the Emporia 1:100,000-scale quadrangle ............ 9

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    Tables 1. Age and relative position of stratigraphic units penetrated during augering. ................................................... 10 2. Nomenclature and maximum elevation for terrace units in map area. ............................................................ 12

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    Conversion Factors Inch/Pound to SI

    Multiply By To obtain

    Length

    inch (in) 2.54 centimeter (cm)

    inch (in) 25.4 millimeter (mm)

    foot (ft) 0.3048 meter (m)

    mile (mi) 1.609 kilometer (km)

    mile, nautical (nmi) 1.852 kilometer (km)

    yard (yd) 0.9144 meter (m) SI to Inch/Pound

    Multiply By To obtain

    Length

    centimeter (cm) 0.3937 inch (in.)

    millimeter (mm) 0.03937 inch (in.)

    meter (m) 3.281 foot (ft)

    kilometer (km) 0.6214 mile (mi)

    kilometer (km) 0.5400 mile, nautical (nmi)

    meter (m) 1.094 yard (yd)

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    Detailed Sections from Auger Holes in the Emporia 1:100,000-Scale Quadrangle, North Carolina and Virginia

    By Robert E. Weems, J. Stephen Schindler, and William C. Lewis

    Introduction The Emporia 1:100,000-scale quadrangle straddles the Tidewater Fall Line in southern

    Virginia and includes a small part of northernmost North Carolina (fig. 1). Sediments of the coastal plain underlie the eastern three-fifths of this area. These sediments onlap crystalline basement rocks toward the west and dip gently to the east, reaching a maximum known thickness of 821 feet (ft) in the extreme southeastern part of the map area (fig. 2). The gentle eastward dip is disrupted in several areas due to faulting delineated during the course of mapping.

    In order to produce a new geologic map of the Emporia 1:100,000-scale quadrangle, the U.S. Geological Survey drilled one corehole to a depth of 223 ft and augered 192 shallow research test holes (maximum depth 135 ft) to supplement sparse outcrop data available from