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Perspective view of the Continental U.S. showing an elevation surface of the top of crystalline Precambrian “basement” rocks

By Geosciences and Environmental Change Science Center July 2022 (approx.)
Perspective view of the Continental U.S. showing an elevation surface of the top of crystalline Precambrian basement rocks
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Detailed Description

Perspective view of the Continental U.S. showing an elevation surface of the top of crystalline Precambrian “basement” rocks. Brown and orange colors depict the highest elevations; greens show the lowest elevations. Surface is incomplete in the western U.S. where there are no published “basement” maps or where crystalline Precambrian rocks are not present.

Sources/Usage

Public Domain.

Don Sweetkind (USGS) compiled from multiple published sources