12 May '11, 1am

WOW! Map of a 1,000 years of #Mississippi River channels @NASA

WOW! Map of a 1,000 years of #Mississippi River channels @NASA

Map of the Ancient Mississippi May 11th, 2011 by Robert Simmon Share this entry Historic flooding along the Mississippi River gives me an excuse to show another of my favorite maps, from Geological Investigation of the Alluvial Valley of the Lower Mississippi River. This map, published in 1944, shows past locations of the Mississippi. Each color represents an old channel, dating back 1,000 years or so. Those that correspond to historical records are dated, while older channels are ordered according to the principle of superposition (newer sediments on top of older ones). Many of the surface layers are still visible in satellite imagery. High-resolution, geolocated maps from Cairo to the Gulf, along with major tributaries, geological maps, and cross sections, are distributed by the U.S. Army Corps of Engineers. This entry was posted on Wednesday, May 11th, 2011 at 6:38 pm a...

Full article: http://earthobservatory.nasa.gov/blogs/elegantfigures/201...

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