The second .PDF shows the reconstructed image of the event. It's nothing like we've ever seen before in our modern age, perhaps not even in the last 40,000 years. I'm not sure if anyone can say with any certainty when the petroglyphs were carved. Personally I'd have thought this whole concept was too bizarre and unlikely if the research wasn't conducted by a leader in plasma physics and not to mention the fact it took years and MILLIONS of such carvings all cataloged by GPS coordinates.