Re: Some examples
An excellent example. Maars would be expected to form where there is an overlying ice cover and this area shows evidence of abundant ice. The cracking in the surface is also indicative of the polygonal terrain that occurs in periglacial regions.
Also maars are known to occur in fields which may explain that multiple craters that seem to be interconnected in this image.
Maar fields on Earth:
Fort Rock Basin Maar Field
http://www.fs.fed.us/r6/centraloregon/resourinfo/geology/volcano/maarfield.html
Bob Clark