Browsing Open File Reports by Issue Date

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  • A Preliminary Report On Nitrate Contamination Of Shallow Ground Waters In Delaware 
    Miller, J.C. (Newark, DE: Delaware Geological Survey, University of Delaware, 1971-10)
    Inspection of water analyses on file at the Delaware Geological Survey revealed that 25 percent of the shallow wells yield water with nitrate concentrations approaching or in excess of the Delaware State Board of Health ...
  • Preliminary Report On Seismic Events In Northern Delaware 
    Jordan, R.R.; Pickett, T.E.; Woodruff, K.D. (Newark, DE: Delaware Geological Survey, University of Delaware, 1972-04)
    Earthquakes are an unfamiliar phenomenon in Delaware. Because of the great public and scientific interest in the seismic events that have recently affected northern Delaware, this Open File Report has been prepared to ...
  • Preliminary Report On The Earthquake Of February 28, 1973 
    Woodruff, K.D.; Jordan, R.R.; Pickett, T.E. (Newark, DE: Delaware Geological Survey, University of Delaware, 1973-04)
    This report has been prepared to fill an immediate need for information on the earthquake that affected northern Delaware on February 28, 1973. Public interest in seismic events has grown in the past two years because of ...
  • Papers Presented By Staff Members Of The Delaware Geological Survey At The Baltimore Meeting Of The Northeastern Section Of The Geological Society Of America, March, 1974 
    Pickett, T.E. (Newark, DE: Delaware Geological Survey, University of Delaware, 1974-05)
    This report is a compilation of four papers presented by DGS staff members at the Baltimore Meeting of the Northeastern Section of the Geological Society of America, March, 1974.
  • Geologic Cross-Sections, Cenozoic Sediments of the Delmarva Peninsula and Adjacent Area 
    Spoljaric, N. (Newark, DE: Delaware Geological Survey, University of Delaware, 1975)
  • Removal Of Metallic Contaminants From Industrial Waste Waters By The Use Of Greensands, A Preliminary Report 
    Spoljaric, N.; Crawford, W.A. (Newark, DE: Delaware Geological Survey, University of Delaware, 1975-01)
    The Delaware Geological Survey, in cooperation with the U. S. Bureau of Mines, has investigated glauconite-bearing greensand deposits in Delaware for several years. The purpose of this effort is to find possible practical ...
  • Review Of The Subsurface Geology And Resource Potential Of Southern Delaware 
    Benson, R.N. (Newark, DE: Delaware Geological Survey, University of Delaware, 1976-04)
    This review summarizes the present knowledge of the subsurface geology and resource potential of southern Delaware and outlines the needs for future studies to gain further understanding of these matters. Because of the ...
  • Guidebook: Columbia Deposits Of Delaware 
    Jordan, R.R.; Talley, J.H. (Newark, DE: Delaware Geological Survey, University of Delaware, 1976-05)
    The Columbia sediments of Delaware cover almost all of the surface of the Coastal Plain portion of the State. A major unconformity separates these predominantly sandy materials from the underlying rocks of the Coastal ...
  • Geologic Field Trips In Delaware 
    Benson, R.N.; Hahn, W.F.; Jordan, R.R.; Pickett, T.E.; Talley, J.H.; Thompson, A.M.; Woodruff, K.D. (Newark, DE: Delaware Geological Survey, University of Delaware, 1977-05)
    The information contained in this Guidebook was compiled on the occasion of the Annual Meeting of the Association of American State Geologists held in Delaware in June 1977. The Delaware Geological Survey is pleased to ...
  • Preliminary Results Of Seismic And Magnetic Surveys Off Delaware's Coast 
    Woodruff, K.D. (Newark, DE: Delaware Geological Survey, University of Delaware, 1977-07)
    The nature and occurrence of subsurface resources, whether ground water, minerals, or petroleum, are controlled by the geologic history and framework of any particular area. Several years ago the staff of the Delaware ...
  • Landsat View of Delaware 
    Spoljaric, N. (Newark, DE: Delaware Geological Survey, University of Delaware, 1979)
    In Delaware some linear features recognized on the Landsat image can be related to known faults. Others are interpreted as possible faults; the causes of some lineations are not yet known. Circular features are more difficult ...
  • Effects Of Earthquakes And Earth Tides On Water Levels In Selected Wells In The Piedmont Of Delaware 
    Talley, J.H. (Newark, DE: Delaware Geological Survey, University of Delaware, 1980-02)
    Examination of continuous water-level hydrographs from two artesian observation wells in the Piedmont near Newark, Delaware reveals water-level fluctuations caused by earthquakes and by earth tides. The effects of 14 distant ...
  • Delaware's Extractive Mineral Industry 
    Doyle, R.G.; Pickett, T.E. (Newark, DE: Delaware Geological Survey, University of Delaware, 1981-01)
    The purpose of this report is to provide information on the mining industry of Delaware as an essential component of a growing economy. The industry, particularly in sand and gravel mining, must deal with uneven regulation, ...
  • Sinkholes, Hockessin Area, Delaware 
    Talley, J.H. (Newark, DE: Delaware Geological Survey, University of Delaware, 1981-03)
    Sinkholes are depressions in the land surface or holes in the ground caused by subsidence or collapse of surficial material into openings in soluble rock. Sinkholes usually develop in "karst" areas underlain by carbonate ...
  • Geologic Aspects Of Disposal Of Highly Radioactive Nuclear Waste 
    Spoljaric, N. (Newark, DE: Delaware Geological Survey, University of Delaware, 1981-05)
    This report was prepared to provide a simple but comprehensive overview of programs and concepts of highly radioactive waste disposal. This report is not based on original research, but was prepared from data and information ...
  • Regolith Thickness of the Delaware Piedmont 
    Christopher, M.J.; Woodruff, K.D. (Newark, DE: Delaware Geological Survey, University of Delaware, 1982)
    This map shows the total thickness (regolith) of both the loose, transported material and the weathered rock that overlies crystalline rocks of the Delaware Piedmont. Transported material is generally thin and the weathered ...
  • Geologic And Hydrologic Aspects Of Landfills 
    Spoljaric, N.; Talley, J.H. (Newark, DE: Delaware Geological Survey, University of Delaware, 1982-03)
    In the United States more than 3.5 billion tons of solid waste are generated annually. Of this, more than 2 billion tons are agricultural waste, such as manure and crop waste. Almost 300 million tons are generated by ...
  • A Guide To Information On Benchmarks In Delaware 
    Schenck, W.S. (Newark, DE: Delaware Geological Survey, University of Delaware, 1982-03)
    To conduct an elevation survey, a surveyor needs a starting point for which the exact elevation above mean sea level is known. These starting points are called benchmarks. State and federal agencies install benchmarks ...
  • A Numerical Indicator Of Water Conditions For Northern Delaware 
    Jordan, R.R.; Woodruff, K.D. (Newark, DE: Delaware Geological Survey, University of Delaware, 1982-05)
    Numerical indicators, or indices, are widely used to measure the status of complex relationships. As such, indices have become accepted by researchers and the public in such disparate fields as economics, air quality, and ...
  • Saturated Thickness of the Columbia Formation in Southern New Castle County, Delaware 
    Groot, J.J.; Demicco, P.M.; Cherry, P.J. (Newark, DE: Delaware Geological Survey, University of Delaware, 1983)
    This map shows the saturated thickness of the Columbia Formation. The Columbia Formation covers most of the Coastal Plain of Delaware. Because it consists primarily of coarse sand, it is important to the hydrology of the ...

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