|Dry ice-blocks formed
Grooves from ridge of
Russel Crater's Dune
NASA/JPL/Malin Space Science Systems
Note closely the right-angle grooves^^>>
their orientation is consistent
|Interior and exterior grooves
and ridges are common
More images of
Despite all these simalar features made with electric discharge,
there is a far more plausable explanation, as of 2013, from researchers at JPL.
They propose dry ice blocks skidding across the surface, and they back it with experiments
Match to CRT feature found in Gale crater on Mars.
Mars Image, Inside Gale Crater
CRT surface........Another view
Better images of Interior Grooves
If you shot any photos or video of these experiments during the Expo please contact me.
Thin were the plans of mice and men..(tyadt)