A Surficial Hydrogeologic Framework for the Mid-Atlantic Coastal Plain

The hydrogeologic framework was developed from a combination of the physiography and the
predominant texture of surficial geologic units in the Mid-Atlantic Coastal Plain. It describes
the primary natural physical factors that affect the flow and chemistry of shallow ground water
and small streams in the Mid-Atlantic Coastal Plain. Seven hydrogeologic subregions were
defined. Some of the subregions correspond directly to the physiographic subprovinces of the
region; others were generalized within subprovinces based on sediment texture. For more
information, see U. S. Geological Survey Professional Paper 1680.