This anomaly was originally identified by Efrain Palermo, in the MSSS Archives. The original image processed by MSSS was overly contrast-enhanced and exhibited a strange square processing artifact that originally caught the attention of Efrain.

I processed this image directly from the original raw image, applying destriping, moderate contrast enhancement, sharpening and enlarging 2x.  North is to the bottom of the image. The sun is from the upper left in this image.

Because the raw image is 3.5 meters / pixel, the object is about 100 meters across, and appears to be roughly heart- or triangle-shaped.

Upon close examination, several anomalies are apparent. There appear to be several support structures on the top. The shadows on the lower left suggest that the object is raised above the otherwise relatively uniform surface.

The area to the North is...

(Click on images for full resolution views in separate windows.)
 

This is a Viking raw image of the area I processed, showing the anomaly at a distance. This link shows the location of the anomaly on the side of the fish-shaped depression. The sun is to the right.

Compare with the context image taken by MGS.
 

These images are 256 pixel / degree surface map views of the area made from 1/16 degree MOLA data,  the first with color from the Viking red-synthesized green-violet map, and the second from a synthetic color processing from the MOLA elevation data. The location of the anomaly in the depression is in the purple area, a very high plateau. Maybe the crash was controlled flight into terrain, a common pilot error. Or maybe not. This looks like a good place for training flights, Area 51 on Mars?
 

This is a 3-d context view showing the 3-d cliffs, explaining the strange patterns at the lower left of the MGS context image. This shows the advantage of 3-d imaging. Soon we will have MGS maps and even higher resolution elevation data.
 

This is a 3-d view I made with a from shape-from-shading program I wrote in IDL, of the object showing the blast area. Note the two impressions possibly caused by material ejected from the object during an explosion. The direction of the possible craft may have been  from the upper left to the lower right, suggesting this craft may have been triangle-shaped as it slammed into the ground, created an explosion which destroyed the right side of the craft and created a wide, spreading pattern of blast debris.
 

This view shows one side and back of the object in more detail. Note the 'string of pearls' and the wake-like pattern in the surface to the lower left which may have been caused by the propulsion system of the craft. It looks like the TR3-B prototype I saw near Travis AFB in 1994, in Northern California (Bird's Landing to be exact).

The 'hanging beam' appears to cast a shadow on the right side. Note the dark cross-shaped area and circular depressions to the lower left of the cross.
 

This might be a possible design template for the possible craft. Or it might be a alien-inspired TR3-B Triangle that I saw in 1994 near Travis AFB in N. California. Edward Fouche claims to have worked on this spacecraft .

This is another site showing the triangle.

More on the theory of operation of the TR3-B triangle

Maybe this very high volcano in the crater nearby is where they came from? Or maybe there were just going that way for a sightseeing trip and had a bad accident. Too bad. It must have been a nice place to visit when there was water there.
 

This is another view showing the unusual shape of the volcano.
 

This is a view from the north showing the isolated mounds visible in the distance 3d context image.
 

This is another view of the area toward the southwest, from a higher elevation.
 

This is a view from the south. Note the 'monolith' below the plateau.
 

This is a closeup of the monolith. It looks like a projection screen positioned to be viewed from above. But it might be an illusion, although the correlation between the topographical data and the Viking map shading is interesting.