Saw an article the other day saying it was covered in rainforest, but it was 90m years ago. The big meteor hit was 65m yag for context. But if 'they' were so advanced would they not have survived?
With it being millions of years perhaps the dinos there evolved to a point they assended physical form and went to another dimension where they could be immortal or something.
Many would probably survive, and would have to live through a long gradual decline into anarchy and barbarism. Imagine how fucking useless contemporary people would be in a post apocalyptic society. A comet or a solar flare could send us back to the bronze age overnight, and pretty much all of our scientific advances would be forgotten in a generation or two.
I think a civ can be a lot more advanced than we are and still get utterly erased by nature.
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