...on a fixed timeline.
I noticed something like that when I glanced at the article. It suggested that the people buried the sites to preserve them because they knew an event was coming.
I thought to myself, "Bernardo, your fellow autists at Poal would love this."
Here's a short informative video from Archaix a chronologist if your interested. He has a few and he is a deep researcher.
Sweet. I'll dig into it. Thanks!