Delaware Geological Survey releases new geologic map of the Saint Georges and Delaware City Area

The Delaware Geological Survey (DGS) has published a new geologic map of the Saint Georges area titled Geologic Map of the Elkton, Saint Georges and Delaware City Quadrangles, Delaware. Geologic Map 27 presents the results of research by Jaime L. Tomlinson and Kelvin W. Ramsey of the DGS. The map supersedes the surficial geology of DGS Geologic Map No. 1: Geology of the Chesapeake and Delaware Canal Area, Delaware by Thomas E. Pickett (1970) and DGS Geologic Map No. 13: Geologic Map of New Castle County, Delaware by Kelvin W. Ramsey (2005) (Ramsey, 2005).

Geologic Map 27 illustrates and describes the geologic units found at the land surface and in the shallow subsurface of the Saint Georges and Delaware City area. It contains detailed descriptions and ages of all units presented on the map as well as a cross section that shows the geology and names of units underlying the units exposed at the land’s surface. The map provides geologic information for use in regulatory land-use decision making, delineation and protection of water resources, and to identify potential sand and gravel resources. When used in conjunction with supporting subsurface geologic information, the map can aid in locating water supplies for public, domestic, agricultural, and industrial use, for mapping groundwater recharge areas, and for protecting groundwater and surface-water resources northern Delaware. The map is part of the Delaware Geological Survey’s ongoing mission to understand geologic and hydrologic systems and to advise, inform, and educate Delawareans about the results of such investigations.

DGS Geologic Map No. 27 is available as a PDF to view online or as a downloadable product from the DGS web page at

For questions and information, contact DGS at, 302-831-2833