aquifer plain coastal atlantic system major layered sequence aquitard units ha society science water sediments text figure edu dip sedimentary
continental shelf north america plate passive margins map boundary atlantic ocean gulf mexico divergent crust surrounded geology tectonics nps gov
atlantic continental terraces relief outlined divins metzger structural fig12
atlantic usgs mid map region coastal plain compilation data states geospatial ds pubs gov
coastal map wetlands freshwater tidal non range epa saltwater watershed watersheds highlighting found diagram protection information sites restoration important