"After a couple million years traces of archeological artifacts should be zero."

Why? We have fossil remains of organisms going back for about three billion years. When I was at university I extracted and studied epidermal cell material from ancient Araucaria species (modern-day equivalents would be monkey puzzle and Norfolk Island pine trees). Not big bones, not petrified stuff: soft leaf tissue from the Jurassic, the real McCoy. So why would you think that archaeological remains made of hard rock would disappear in a couple of million years? That sounds like the seven-stars pete school of mythology...

And not science fiction, Maggie. Just fiction.