1. Education

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.

Alabama

Alaska

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

Florida

Georgia

Hawaii

Idaho

Illinois: Bedrock

Illinois: Quaternary Cover
Illinois is covered with recent glacial deposits, shown in this map from the state geological survey.

Indiana: Bedrock

Indiana: Quaternary Cover
A clickable map from the Indiana Geological Survey shows the state's glacial deposits.

Iowa: Bedrock

Iowa: Quaternary Cover
An Iowa Geological Survey Bureau map with all the glacial details.

Kansas

Kentucky

Louisiana

Maine: Bedrock

Maine: Quaternary Cover
Maine's extensive glacial deposits, from the Maine Geological Survey.

Maryland

Massachusetts

Michigan: Bedrock

Minnesota: Bedrock

Mississippi

Missouri

Montana

Nebraska: Bedrock

Nevada

New Hampshire: Bedrock

New Jersey

New Mexico

New York

North Carolina

North Dakota: Bedrock

North Dakota: Surface Geology
Rocks and glacial sediments cover the state, shown at three sizes.

Ohio: Bedrock

Ohio: Surface Geology
Glacial traces and sediments mapped by the Ohio Geological Survey.

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin: Bedrock

Wisconsin: Quaternary Cover
Glacial deposits of the state from the University of Wisconsin Extension.

Wyoming

USGS National Geologic Map Database
Everything that's available online is here on one page. A must-have for any outing.

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