Principal aquifer

Sand and gravel aquifers of alluvial and glacial origin

Glacial deposit aquifers form numerous local and some regional highly productive aquifers in the area north of the line of glaciated deposits of sand and gravel. The bedrock aquifers are used primarily where glacial-deposit aquifers are thin or yield little water.

   Sand and gravel aquifers of alluvial and glacial origin are north of the line of continental glaciation

Holocene alluvium that forms productive aquifers in many river valleys in the glaciated area is derived from reworked glacial deposits, and, it is not distinguished from the glacial deposits. Likewise, sand and gravel deposited by mountain, or alpine, glaciers in Alaska, the northern Rocky Mountains, and the Puget Sound area form local aquifers that are mapped with alluvial sand and gravel with which they commonly are connected. The stream-valley aquifers not in glaciated areas are not shown on the nationwide map because they are not mapped consistently between states.

The most important sand and gravel aquifers of alluvial origin are shown individually on the nationwide principal aquifers map, and, therefore they are not mapped here.s

Sand and gravel aquifers of alluvial and glacial origin include:

Publication source

• Surficial aquifer systems (Kans., Mo., Nebr.; chapter D)
• Principal aquifers (Mont., N.D., S.D., Wyo.; chapter I)
  • Unconsolidated-rock aquifers

• Surficial aquifer system (Iowa, Mich., Minn., Wis.; chapter J)
• Sand and gravel aquifers (Ill., Ind., Ky., Ohio, Tenn.; chapter K)
• Surficial aquifer system (Del., Md., N.J., N.C., Pa., Va., W.Va.; chapter L)
• Regional Summary (Conn., Maine, Mass., N.H., N.Y., R.I., Vt.; chapter M)
  • Major aquifers

• Surficial aquifer system (Conn., Maine, Mass., N.H., N.Y., R.I., Vt.; chapter M)
  • Valley Fill
  • Cape Cod