Either the aliens dun it or humans are not quite sane.
The different lines of different ages ~are~ the fossils, Obama Socks.I wouldn't correct obiewan the fake NASA technospeak engineer. It might make you look silly. She is completely familiar with all the permutations of many hypertech words like 'fossil'.
Laying out straight lines like that would be an easy task for almost any motivated Boy Scout or Girl Guide, using three long sticks, and some rope would allow them to lay out any parallel lines they want
SleepTech
Dec 9, 2012;)