Bedrock Geologic Map of North Dakota

_{Image courtesy North Dakota Geological Survey}

This is North Dakota without its surface blanket of glacial sand and gravel, which covers three-fourths of the state. The outlines of the broad Williston basin in the west are clear; these rocks all date from Tertiary times (younger than 65 million years). The rest, starting with the light blue, make up a thick Cretaceous section covering the eastern half of the state. A narrow strip of Archean basement, with a few stray blobs of Ordovician (pink) and Jurassic (green) rocks, spills across the border from Minnesota.

The 800x650 pixel version weighs 300 KB, and everything on it is legible. For further precision and enjoyment, or perhaps for printing at higher resolution, try the 1200x1000 pixel version (550 KB). You can buy a printed 8-1/2 x 11 copy from the state; order publication MM-36.

More about North Dakota Geology

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North Dakota Maps
North Dakota Geography, State Symbols & Facts
North Dakota National Parks
North Dakota State Parks
North Dakota Campgrounds
North Dakota Forests
North Dakota Hunting
North Dakota Archaeology

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