Mapping was conducted using field maps at a scale of 1:12,000 with 2-ft contours. Stratigraphic boundaries drawn at topographic breaks reflect detailed mapping using contours not shown on this map. Most stratigraphic units mapped in stream valleys are projected from subsurface data. Except for a few erosional bluffs, these units are covered by colluvium. This map supersedes Geology of the Middletown-Odessa Area, Delaware: Delaware Geological Survey Geologic Map Series No. 2 (Pickett and Spoljaric, 1971).
The geological history of the surficial units of the Seaford East Quadrangle and the Delaware portion of the Seaford West Quadrangle was the result of deposition of the Beaverdam Formation and its subsequent modification by erosion and deposition related to sea-level fluctuations during the Pleistocene. The geology reflects this complex history by the cut and fill geometry of the middle and late Pleistocene deposits incised into the Beaverdam Formation.
The Delaware Geological Survey (DGS) is identifying areas where sand is available to restore the state’s dunes and beaches following coastal storms through a new agreement with the Bureau of Ocean Energy Management (BOEM).
Housed at the University of Delaware’s College of Earth, Ocean, and Environment, DGS will evaluate the state’s existing geologic and geophysical data to pinpoint sand resources for future needs.
Delaware, Maryland and Virginia have each partnered with the Bureau of Ocean Energy Management to find new sand sources using existing mapping data. As part of the federal Disaster Relief Appropriations Act of 2013, which allocated $13.6 million to the bureau, all three states will each receive $200,000 for the two-year project.
As a part of President Obama’s continuing commitment to help coastal communities recover from Hurricane Sandy and promote resilient coastal systems, the Bureau of Ocean Energy Management (BOEM) and the State of Delaware signed a two-year cooperative agreement totaling $200,000 to identify sand resources for coastal resilience and restoration planning. The agreement will help BOEM and Delaware conduct research that will assist coastal communities recovering from Hurricane Sandy, restore habitat, increase our knowledge of sand resources offshore, and contribute to long-term coastal resilience planning efforts.
Under this agreement, the Delaware Geological Survey (DGS), located at the University of Delaware, will evaluate and consolidate Delaware’s existing geologic and geophysical data. The data will be used to identify new sand resources to meet future needs.
4:37 p.m., Oct. 31, 2012--The Office of the State Climatologist and the Delaware Geological Survey (DGS), both based at the University of Delaware, provided the Delaware Emergency Management Agency (DEMA) and the National Weather Service with weather, coastal flooding and stream flooding information for Delaware during Hurricane Sandy.
The complex geologic history of the surficial units of the Harbeson Quadrangle is one of deposition of the Beaverdam Formation and its subsequent modification by erosion and deposition related to sea-level fluctuations during the Pleistocene. The geology is further complicated by periglacial activity that produced dune deposits and Carolina Bays scattered throughout the map area.
On a small, homemade barge, built from the skeleton of an old ship, a gray slurry of bay bottom sand flows out, of a pipe into a bucket. Two scientists, a well driller and two student interns drill a hole in the floor of the Indian River Bay. They'll install a very long pipe into the hole and use it to monitor groundwater - how much flows 'into the bay, how salty it is and how many nutrients it carries with it.