Weird section        
Glacier 1
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14"      17"     19"
M0306104_glacier1.jpg (210475 byte) 		NASA original is M0306104 - 5.35°W - 60.77°S

The frontside of this "thing" is approx 2,2Km wide, in the narrowest point. I think it's glacier, Mars way.

The image on the left was taken in this area:

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Glacier 2
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14"      17"     19"
M0800063_glacier2.jpg (185886 byte)		 NASA original image is M0800063 - 111.70°W - 76.25°S

A possible explanation for this huge structure is a glacier formed by CO2 iced.

The image on the left was taken in this area: