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.

Be sure to click on the enlargement option to view its enhanced 3D perspectives. It's well worth the download time!

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for enlargement.

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

The distances across the image are approximately 150 miles by 150 miles. Although the actual vertical relief across the image is something less than 600 feet, the vertical exaggeration perceived in the image is much higher (150X).

All lands within this image region are part of the Missouri River drainage. One of the major reservoirs of the Missouri River (Lake Oahe) is included. Oahe Dam (south of this image) pools Missouri River waters northward almost to Bismarck.

The prominent "softening" of the topography east of the Missouri River is a reflection of landscape modification by late Pleistocene glaciations. Included in this image is part of the Missouri Coteau, an extensive surface of dead-ice moraine. Moraines, such as the Streeter Moraine, are the result of glacial advances of the last ice.

Most of the region in this image west of the Missouri River was unglaciated. It is much more dissected, with the topography being largely bedrock-controlled. 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 K-T boundary (the extinction boundary for dinosaurs) has been mapped in outcrops in this region.

For those of you clicking on the larger (458 KB) image, prominent lines are impressed at 46° N. lat. and 100° W. long.  These are artifacts of suturing datasets together to make this image and therefore do not reflect any real structure.

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