A pair of red / blue 3D glasses is required to view this anaglyph. Please note that the red lens should be over the left eye.

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This anaglyph was produced by Ray Sterner of the Applied Physics Laboratory at Johns Hopkins University using USGS DEM data.

The east-west distance across the image is approximately 225 miles, and the north-south distance is about 160 miles. The image includes the southwest quarter of North Dakota and adjacent areas of South Dakota and Montana. Although the actual vertical relief across the image is something less than 1850 feet, the vertical exaggeration perceived in the image is much higher (150X). The highest point in North Dakota (White Butte, elev.: 3506 feet) is visible in the southwestern corner of the image.

Nearly all lands within this image region are part of the Missouri River drainage. Two of the major reservoirs of the Missouri River (Lake Sakakawea and Lake Oahe) are shown.

In contrast to the strong, southeasterly drainage trend in the southern half of the image, the Little Missouri River cuts due a northerly path, suggesting interesting questions about its past role in stream piracy. Downcutting by the Little Missouri River into soft continental sediments of early Tertiary age have resulted in the spectacular badlands that now make up Theodore Roosevelt National Park.

South and southwest of Bismarck, outcrops of Cretaceous and early Tertiary bedrock show a contrasting structure -- an exaggerated reflection of what is actually a gentle westward dip for these strata.

The prominent "softening" of the topography east and north of the Missouri River is a reflection of landscape modification by late Pleistocene glaciations. Included in this image is part of the Missouri Coteau, a surface of dead-ice moraine bordered to the northeast by the prominent northeast-facing Missouri Escarpment. Most of the region in this image west and southwest of the Missouri River was unglaciated.

For those of you clicking on the larger (488 KB) image, a prominent east-west line is impressed at 48° N. lat.   This is an artifact of suturing two datasets together to make this image and does not reflect any real structure.

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