I suppose it's possible that soil could slump and crack in a rectilinear pattern, but have never seen that anywhere else on the Red Planet.  This is a far northern latitude with frozen precipitation on the ground. 

can't find the reference for this  image

http://ida.wr.usgs.gov/html/m01004/m0100484.html 

Parameters for MOC Standard Data Product m0100484
General MOC Image m0100484 Orbit 736 Columns 256 Rows 256 Orientation True	Geometry Latitude 44.19° Longitude 44.25° Resolution * 11.95 m Phase Angle 39.69° Incidence Angle 39.71° Emission Angle 0.11° North Azimuth 94.10° Slant Range (km) 414.91 Spacecraft Altitude (km) 414.91	Engineering Gain AA Offset 28 Summing Mode (Downtrack) 8
Image Description: Science Campaign A (Geodesy)

Isn't it perfectly obvious that liquid water has flowed over the Martian surface?

sorry, can't find the reference for this image

http://ida.wr.usgs.gov/html/fha012/fha01218.html 

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