For evidence of this I think the archaeologists should focus on finding the holes in the corners of the mustatils where they planted their tiki torches used to guide those UFO pilots home.

Maybe all the goat, cattle, and gazelle heads is just evidence that aliens are only interested in the rear portions of earth's animals. That would bolster my personal theory that earth is nothing more than a training ground for alien proctologists and gastroenterologists. Their first visit convinced them that there was nothing here but a bunch of assholes so they decided that in spite of that there was still something they could learn here.

I laughed thank you. Then it got me thinking. If it were the case, hypothetically, ... These would be terrible. It would mean they'd have wings, they'd need air for landing, otherwise it wouldn't be a strip, it'd be just a pad.

Unless, their vehicle is somehow oblong, which is a possibility. However, some of those sights are shown on mountain slopes, what a terrible place to land.

Unless, being that old, those mountains slopes weren't slopes back then.

Finally, why wouldn't there be any wreckage of any type of vehicle from back then? Shouldn't there be at least one ounce of evidence of a past crash?

Unless, their vehicles were made of goat skulls, bones and rocks?

... A $5 Amazon ebook that writes itself. All hail the Ori!

Preposterous.

These are clearly UFO launching strips.