NORTH DAKOTA STATE UNIVERSITY - FARGO, N D

3D ANAGLYPH OF THE
NORTHWESTERN
NORTH DAKOTA

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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 distances across the image are approximately 140 miles by 140 miles. Although the actual vertical relief across the image is only about feet, the vertical exaggeration perceived in the image is much higher (150X).

The Little Missouri River cuts into soft continental sediments of early Tertiary (Paleocene) age, resulting in the spectacular badlands that now make up Theodore Roosevelt National Park. The "North Unit" of the park is included in this image.

The Killdeer Mountains (elev. 3314 feet) are among the most prominent buttes in North Dakota. They are capped by resistant rocks of Miocene age (20-25 million years in age) formed of lake sediments rich in volcanic ashes.

The prominent "softening" of the topography north and northeast 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 south and southwest of the Missouri River was unglaciated.

At the close of the last ice age, the Des Lacs and Souris Rivers served as major outlets for glacial meltwaters. Catastrophic flood releases from Glacial Lake Regina (in Saskatchewan, off to northwest of this image) widened and deepened both valleys, with flood drainages rejoining into a single channel near Minot (just off to east of image).

A north-south continental divide parallels the Missouri Escarpment in this image. Northeast of this divide, waters drain northward via the Souris-Red River system, ultimately being delivered into Hudson Bay via the Nelson River. Waters southwest of this divide drain southeastward via the Missouri River, ultimately to arrive at the Gulf of Mexico via the Mississippi River. Lake Sakakawea is a large reservoir above where the Missouri River is dammed by Garrison Dam (just off to east of image).


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