Eberswalde Delta contains river meanders, which indicate that flowing water was present for an extended period of time, not just the weeks required to explain the catastrophic flood channels.

Available here are two red-blue color anaglyphs in which you can view the topography with red-blue glasses (blue filter over your right eye). The first of these anaglyphs shows a relatively large area but with 3x reduction of spatial scale (75 cm/pixel), and the second is a sample at full resolution (25 cm/pixel, 10 MB).

The former river channels are high rather than low, which is called inverted relief. Coarse gravel was deposited in the stream channel, which later proved more resistant to erosion than the materials outside the channel, creating this inverted relief.

Meanders are formed when a river channel gradually erodes the outer banks, increasing the curvature of the channel. Eventually the river decides to take a short cut, cutting off a meander, as shown here. This produces what are called oxbow lakes.

(We previously released image PSP_001334_1560, including color, but acquired a later image (PSP_001534_1560) over this same area but from a different viewing angle to provide stereo coverage.)

For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.