Quote:
Originally Posted by Vars191
Just look at edges and the impression, the only way you will get that form is by slow depression
push a golf ball into soft ground you will get the same look
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No no no no....sinkholes tend to form with steeped sided walls and are caused by dissolution of the underlying bedrock via seeping/flowing groundwater. They also occur mainly in areas of very porous and/or easily dissolvable rock (i.e carbonate rocks). It's what they call Karst topography. The underlying bedrock in this region of Mars is neither carbonate or porous....it's a mixture of non carbonate sediments and volcanics. Not only that, like I mentioned before, you have a shallow, bowl shaped crater surrounded by an ejecta blanket, a raised rim with overturned rock layers (which you don't get in karsts) and slumping caused by collapse of the crater wall along arcuate faults in the surrounding rock. That's also where those steep cliffs along the wall come from...the faulting in the rock and the subsequent slump of the rock walls.