20211209 10043400 1.0 TRUE USGS Aquifers Principal This map layer contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands, portrayed as polygons. The map layer was developed as part of the effort to produce the maps published at 1:2,500,000 in the printed series "Ground Water Atlas of the United States". The published maps contain base and cultural features not included in these data. This is a replacement for the July 1998 map layer called Principal Aquifers of the 48 Conterminous United States usgs principal aquifer rock groundwater This data set represents the extent of the alluvial and glacial aquifers north of the southern-most line of glaciation. These data delineate the areal extent of the alluvial and glacial aquifers as defined in The Ground Water Atlas of The United States. 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