Browsing DGS Reports of Investigations by Title

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  • Woodruff, K.D. (Newark, DE: Delaware Geological Survey, University of Delaware, 1984-07)
    Earthquakes in Delaware and surrounding areas have been well documented historically since about the early 1700’s and since 1972 by instrumental records. Most of the Delaware events have occurred in the Wilmington area ...
  • Denver, J.M. (Newark, DE: Delaware Geological Survey, University of Delaware, 1989-06)
    The unconfined aquifer is a major source of water supply in eastern Sussex County, Delaware. It also is an important source of water for surface-water bodies and deeper, confined aquifers. The aquifer consists mainly of ...
  • Andres, A.S. (Newark, DE: Delaware Geological Survey, University of Delaware, 1987-06)
    The results of water-budget and flow-net model calculations indicate that the rate of fresh ground-water discharge into Rehoboth and Indian River bays is in the range of 21 to 43 million gallons per day. The estimates ...
  • Andres, A.S.; Martin, M.J. (Newark, DE: Delaware Geological Survey, University of Delaware, 2005)
    A geographic information system-based study was used to estimate the elevation of the water table in the Inland Bays watershed of Sussex County, Delaware, under dry, normal, and wet conditions. Evaluation of the results ...
  • McKenna, K.K.; Ramsey, K.W. (Newark, DE: Delaware Geological Survey, University of Delaware, 2002)
    Lithologic logs from 268 vibracores taken from the Delaware Atlantic offshore were evaluated for sediment type and compatibility with historical beach sediment textures. A model of sand resource evaluation, known as ...
  • Bonini, W.E. (Newark, DE: Delaware Geological Survey, University of Delaware, 1967-06)
    Pleistocene channels along the margins of the Atlantic Coastal Plain are developed in crystalline and Triassic sediments (Bonini and Hickok, 1958), or into the Cretaceous and Tertiary coastal plain sediments (Widmer, 1965). ...
  • Doheny, E.J. (Newark, DE: Delaware Geological Survey, University of Delaware, 1998)
    The stream-gaging network in Delaware is a major component of many types of hydrologic investigations. To ensure that the network is adequate for meeting multiple data needs by a variety of users, it must represent the ...
  • Baker, W.W.; Varrin, R.D.; Groot, J.J.; Jordan, R.R. (Newark, DE: Delaware Geological Survey, University of Delaware, 1966-03)
    At present, Delaware has an abundance of water for the foreseeable future, but is already faced with water problems in some municipalities. These can only be resolved satisfactorily through complete evaluation of the State's ...
  • Spoljaric, N. (Newark, DE: Delaware Geological Survey, University of Delaware, 1979-12)
    This report was prepared to provide a concise description of offshore operations related to exploration for petroleum (oil and natural gas) from the initial geologic and geophysical investigations to production. Petroleum ...
  • Woodruff, K.D. (Newark, DE: Delaware Geological Survey, University of Delaware, 1970-07)
    Information on ground-water quality in Delaware has become critical for three reasons: (1) increased water demand, (2) need for a better understanding of ground-water flow patterns, (3) need for a "base" against which ...
  • Plank, M.O.; Srogi, L.A.; Schenck, W.S.; Plank, T.A. (Newark, DE: Delaware Geological Survey, University of Delaware, 2001)
    Geochemical data from Ordovician and Silurian mafic rocks in the Wilmington Complex in Delaware, the James Run Formation in Cecil County, Maryland, and the Wissahickon Formation in Delaware and Pennsylvania were collected ...
  • Andres, A.S.; Benson, R.N.; Ramsey, K.W.; Talley, J.H. (Newark, DE: Delaware Geological Survey, University of Delaware, 1990-10)
    Borehole Oh25-02, located about 3 miles southwest of Lewes, Delaware, ends at a total depth of 1,337 ft in a mid-Oligocene glauconitic silt unit. It penetrated 317 ft of glauconitic sands and silts between the base of the ...
  • McLaughlin, P.P. Jr.; Velez, C.C. (Newark, DE: Delaware Geological Survey, University of Delaware, 2006)
    Ground water comprises nearly all of the water supply in Kent County, Delaware. The confined aquifers of the area are an important part of this resource base. The aim of this study is to provide an up-to-date geologic ...
  • Woodruff, K.D.; Miller, J.C.; Jordan, R.R.; Spoljaric, N.; Pickett, T.E. (Newark, DE: Delaware Geological Survey, University of Delaware, 1972-05)
    The results of an intensive ground-water study on University of Delaware lands in the Newark area revealed additional sources of available ground water. Geophysical techniques, air-photo interpretation, studies of existing ...
  • Spoljaric, N. (Newark, DE: Delaware Geological Survey, University of Delaware, 1972-03)
    The complex geologic framework of the Fall Zone in Delaware is primarily caused by diverse structural features present in the crystalline basement rocks that have exerted a considerable influence on the distribution of the ...
  • Ramsey, K.W.; Groot, J.J. (Newark, DE: Delaware Geological Survey, University of Delaware, 1997)
    Investigation of the Neogene and Quaternary geology of the Milford and Mispillion River quadrangles has identified six formations: the Calvert, Choptank, and St. Marys formations of the Chesapeake Group, the Columbia ...
  • Ramsey, K.W. (Newark, DE: Delaware Geological Survey, University of Delaware, 2005)
    This publication formally establishes the Old College Formation, a lithostratigraphic unit located along the Fall Zone of Delaware. It is named for sediments encountered in numerous drill holes on, and adjacent to, the Old ...
  • Andres, A.S.; Ramsey, K.W.; Groot, J.J. (Newark, DE: Delaware Geological Survey, University of Delaware, 1996)
    This report supplements the map "Geology of the Seaford Area, Delaware" (Andres and Ramsey, 1995). The map portrays surficial and shallow subsurface stratigraphy and geology in and around the Seaford East and Delaware ...
  • Miller, J.C. (Newark, DE: Delaware Geological Survey, University of Delaware, 1971-08)
    The need for locating additional sources of ground water for the Delaware Atlantic seashore, a predominantly recreation-oriented area, is indicated by an expanding population in the belt between Philadelphia, Pennsylvania ...
  • Hahn, W.F. (Newark, DE: Delaware Geological Survey, University of Delaware, 1977-08)
    Field reconnaissance, geologic mapping, and photogeologic interpretations aided collectively in the identification of 30 potential high-yield well sites in the crystalline rocks of Delaware's western Piedmont. Fracture ...

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