Greg,
Mars has millions and millions of neat round craters with bowl-shaped interiors and gentle rims.
It has very few neat round breast-like hills.
Simple probability says you're likely wrong.
Now go and check very carefully the viewing geometry of the images you're using. Look Hereat the MSSS image page. Note the context image (georeferenced) shows a large impact crater with dark shading in it's northern half. Local time is 14.69 decimal hours (early afternoon)
Now look at the little tiled image. See that crater in the middle. See how it's dark shaded on the northern (upper) side. (in fact, both are more NW than N, but they still match) Now, is this not a crater? Go look at the detailed image until you can force it to become a crater (try rotating it or inverting the greyscale if you have problems). Note how the base of the crater contains a darker grey irregular mantling layer, within the bowl. In the "hill" version, this is a most peculiar scabby dent in the top, and looks so odd as to be unreasonable. In the crater version, it is a quite familiar and normal feature, for Mars. QED
Space/Science » in reply to Re: Nah...
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