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GM23 Geologic Map of the Seaford West and Seaford East Quadrangles, Delaware

GM23 Geologic Map of the Seaford West and Seaford East Quadrangles, Delaware

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 geology is further complicated by periglacial activity that produced dune deposits and the Carolina Bays in the map area, which modified the land surface.

DGS Geologic Map No. 23 (Seaford West and Seaford East Quadrangles, Delaware) Dataset

DGS Geologic Map No. 23 (Seaford West and Seaford East Quadrangles, Delaware) Dataset

This vector data set contains the rock unit polygons for the surficial geology in the Delaware Coastal Plain covered by DGS Geologic Map Series No. 23 (Seaford West and Seaford East Quadrangles). 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 the 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 into the Beaverdam Formation. The geology is further complicated by periglacial activity that produced dune deposits and the Carolina Bays in the map area, which modified the land surface. 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. This map is an update of the surficial geology of DGS Geologic Map No. 9: Geology of the Seaford Area, Delaware (Andres and Ramsey, 1995), and is based on new field data in the map area and the mapping of adjacent quadrangles. The purpose of the update is to provide continuity of surficial stratigraphic units in adjacent quadrangles in light of additional data, such as LiDAR data not available in 1995 and revisions to the Quaternary stratigraphy of Sussex County (Ramsey, 2010a). Geologic interpretations of subsurface stratigraphy in Andres and Ramsey (1995), Andres, Ramsey, and Groot (1996), and Andres, Ramsey, and Schenck (1995) have not been revised. Surficial stratigraphic units depicted on this map supersede those of Andres and Ramsey (1995).

DGS Geologic Map No. 17 (Harbeson quadrangle) Dataset

DGS Geologic Map No. 17  (Harbeson quadrangle) Dataset

This vector data set contains the rock unit polygons for the surficial geology in the Delaware Coastal Plain covered by DGS Geologic Map Series No. 17 (Harbeson quadrangle). The complex geologic history of the surficial units of the Harbeson Quadrangle is that 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.

GM17 Geologic Map of the Harbeson Quadrangle, Delaware

GM17 Geologic Map of the Harbeson Quadrangle, Delaware

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.

RI55 Geology of the Milford and Mispillion River Quadrangles

RI55 Geology of the Milford and Mispillion River Quadrangles

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 Formation, and the Lynch Heights and Scotts Comers formations of the Delaware Bay Group. Stream, swamp, marsh, shoreline, and estuarine and bay deposits of Holocene age are also recognized. The Calvert, Choptank, and St. Marys formations were deposited in inner shelf marine environments during the early to late Miocene. The Columbia Formation is of fluvial origin and was deposited during the middle Pleistocene prior to the erosion and deposition associated with the formation of the Lynch Heights Formation. The Lynch Heights Formation is of fluvial and estuarine origin and is of middle Pleistocene age. The Scotts Corners Formation was deposited in tidal, nearshore, and estuarine environments and is of late Pleistocene age. The Scotts Corners Formation and the Lynch Heights Formation are each interpreted to have been deposited during more than one cycle of sea-level rise and fall. Latest Pleistocene and Holocene deposition has occurred over the last 11,000 years.