Miscellaneous Maps
Permanent URI for this collection
The DGS Miscellaneous Map Series includes map products addressing varied subjects in geology or hydrology that do not otherwise fall into our conventional Geologic Map or Hydrologic Map series.
Browse
Browsing Miscellaneous Maps by Author "Benson, R.N."
Now showing 1 - 3 of 3
Results Per Page
Sort Options
Item Map of Exposed and Buried Early Mesozoic Rift Basins/Synrift Rocks of the U.S. Middle Atlantic Continental Margin(Newark, DE: Delaware Geological Survey, University of Delaware, 1992) Benson, R.N.A series of elongate rift basins of early Mesozoic age is exposed in eastern North America in a belt extending from Nova Scotia to South Carolina. The Upper Triassic-Lower Jurassic synrift rocks that fill the basins are called the Newark Supergroup comprising continental (fluvial and lacustrine) clastic sedimentary rocks (predominantly colored red) interbedded with basaltic volcanic rocks (Froelich and Olsen, 1985). Similar basins are buried beneath the sediments of the Atlantic Coastal Plain and continental shelf.Item Seismic Stratigraphy Along Three Multichannel Seismic Reflection Profiles off Delaware's Coast(Newark, DE: Delaware Geological Survey, University of Delaware, 1986) Benson, R.N.; Andres, A.S.; Roberts, J.H.; Woodruff, K.DThree multichannel, common-depth-point (CDP), seismic reflection profiles (Figures 1-3) were run off Delaware's coast (Figure 4) for the Delaware Geological Survey. Their purposes were (1) to determine the depth to the unconformity (=post-rift unconformity) at the base of the nearshore submerged Coastal Plain sedimentary rocks and (2) to relate onshore with offshore geology as interpreted from the U. S. Geological Survey's network of regional seismic profiles (Figure 5). In addition, the nearshore profiles reveal considerable detail about the nature of the Neogene lithostratigraphic units and aquifers within them that supply water to the coastal communities of Delaware and Maryland (Miller, 1971; Weigle and Achmad, 1982).Item Structure Contour Map of Pre-Mesozoic Basement, Landward Margin of Baltimore Canyon Trough(Newark, DE: Delaware Geological Survey, University of Delaware, 1984) Benson, R.N.The structure contour map of pre-Mesozoic basement indicates the structural complexity of the landward margin of the Baltimore Canyon trough, especially that shown by the buried rift basins of probable early Mesozoic age. Information on depth to basement is important in determining the economic limit of drilling through overlying rocks in the search for oil and gas.