Re: Circular formations on Mars, their origin(s)
<In the upper part of the image we see an impact crater of the "splosh" variety, showing all the classic signs of an impact event.
The bottom-right crater seems to sport more of the 'splosh' rim than the upper left crater. The upper left one seems to be/have occured in a drier, rockier surface from looking at the rim. That upper left one could be the youngest of those three. It also seems to be located in a higher elevation.
An excellent photo. Thanks for posting it!
Marcia