alt Hacker NewsThe timelines don't really add up for me.
So there could have been this hypothetical civilization 55 million years ago already. And they've only just disappeared (if they did) 10'000 or so years ago? Without a trace?
Also, no, a conspiracy cannot be the answer to a question we've not yet asked. The word has a clear meaning, it requires people to conspire to hide something from you.
No. The idea is they could have lived and thrived for a few thousand years a few million years ago, then gone extinct.