Dang! Nothing to see here go back to your T.V. This theory has been around a long time and the one I believed to be the most plausible, all the while hoping for something entirely more exciting, what surprises me most is that it took so long to discover or record the evidence.
Yeah, very clever! Scientist never thought to place a time lapse camera over looking the area? Pretty sure they did, at least I'm sure I read about someone doing so, but what happened? Sigh . . . I so wanted little Greys being caught red handed on video pushing those rocks around.