I am not as ready to accept that the meteor landed right smack dab in the middle of a set of fault lines laid out on a checkerboard square pattern.
One fault line which would produce a distorted circle, or two parallel ones which would produce a distorted oval I could accept, but the symmetry of the square pattern is very great. A hit somewhere other than in the middle of a square (very, very rare) geologic formation would be expected to produce a crater of a different shape.
I can not think of any other square geologic formations on that scale anywhere on earth--can anyone else?
It might be that on the scale of the excavation there are many fault lines of approximately the same period, and they would run in the direction of crustal movement as well as perpendicular. Small craters tend to be round. Big craters would depend on the nature of the underlying structure. The earth's crust need not be uniform in all directions.