My call? This is volcanic ash.
Bear tracks at Mt. St. Helens
Fossilized footprints in ash
Under Martian conditions, I don't know how long ash would remain in "Mt. St. Helens" conditions, without rain or other heavy weathering other than wind, and probably not much of that inside a crater. The ash could be millions of years old, yet still take prints easily.
What kind of crater is this, anyway? Why the white edges?