The jagged edges are the result of slow wind erosion, honing the rock edges to razor points. You see this in terrestrial deserts including antarctica.

It is normally a result of long slow erosion - the rate depends on wind speeds, dust availability, and the existence of other processs that could interrupt the wind erosion (on Mars, that would mainly be impacts).

Mars is NOT like Earth, where the surface layers are heaved up and folded and eroded on timescales of a few million years. The "skin" of the Earth (the upper layers of the crust) is renewed and reworked planetwide every few hundred million years.

Mars has aged and evolved with the same skin for 4 billion years. What we see at the surface now has always been "near" the surface (a few hundred metres of erosion can be measured in some places - 400m/4Ga = 1 mm/10,000 years - that's FAST on Mars - on Earth, fast = several cm/year - about a million times faster)

Stop thinking in Earth terms about Mars. Our "common sense" is what we've learned by being inhabitants of Earth and having evolved to suit these conditions. Our instincts and thought processes are inherently WRONG for understanding Mars.

First you have to remember to forget (or rather, put aside) everything that you know about the Earth and how things weather and evolve.

Then you have to think about how things would work on a very different planet

Then you can begin to learn about Mars...