Description: This map layer contains the shallowest principal aquifers of the conterminous United States. These data are intended for use in publications, at a scale of 1:2,500,000 or smaller. Due to the small scale, the primary intended use is for regional and national data display and analysis, rather than specific local data analysis.
Data released October 2003 and downloaded May 2014.
Name: Aquifers of Alluvial or Glacial Origin (USGS)
Display Field: ROCK_NAME
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: 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 (GWA). Data released October 2003 and downloaded May 2014.