[unsupp0rted]

Sure, but what prompted them to do it? When did they do it? What else do we know about them?

[flandish]

> them

Welp, if the TV series “Ancient Aliens” has told us anything it’s that if there is any chance “prehistoric” or “non-white” folks did it, it was aliens. Always aliens. Except when it’s time traveling white humans from the future come to the past to help “those people” carve stones.

(I am mocking the horseshit show, in case anyone worries.)

[adamc]

It's a show PT Barnum would recognize.

[animal_spirits]

The article posted by the top commentor suggests it was used for herding caribou

[hammock]

A fence?