Geologic Maps of the U.S. States
Putting State Geologic Maps Online
A long-term project approaches success.
Illinois: Quaternary Cover
Illinois is covered with recent glacial deposits, shown in this map from the state geological survey.
Indiana: Quaternary Cover
A clickable map from the Indiana Geological Survey shows the state's glacial deposits.
Iowa: Quaternary Cover
An Iowa Geological Survey Bureau map with all the glacial details.
Maine: Quaternary Cover
Maine's extensive glacial deposits, from the Maine Geological Survey.
North Dakota: Surface Geology
Rocks and glacial sediments cover the state, shown at three sizes.
Ohio: Surface Geology
Glacial traces and sediments mapped by the Ohio Geological Survey.
Wisconsin: Quaternary Cover
Glacial deposits of the state from the University of Wisconsin Extension.
USGS National Geologic Map Database
Everything that's available online is here on one page. A must-have for any outing.