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Geologic Maps of the U.S. States
The first and still the only complete set of state geologic maps on the Web. The gallery of 50 bedrock maps starts here. To learn more about the geology of the 50 states, see the Regional Geology category.
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.