Deep history

The surface of the Earth is no place to preserve deep history. This is in spite of – and in large part because of – the many events that have taken place on it. The surface of the future Earth, one hundred million years now, will not have preserved evidence of contemporary human activity. One can be quite categorical about this. Whatever arrangement of oceans and continents, or whatever state of cool or warmth will exist then, the Earth's surface will have been wiped clean of human traces. (...)

Thus, one hundred million years from now, nothing will be left of our contemporary human empire at the Earth's surface. Our planet is too active, its surface too energetic, too abrasive, too corrosive, to allow even (say) the Egyptian Pyramids to exist for even a hundredth of that time. Leave a building carved out of solid diamond – were it even to be as big as the Ritz – exposed to the elements for that long and it would be worn away quite inexorably.(...)

So there will be no corroded cities amid the jungle that will, then, cover most of the land surface, no skyscraper remains akin to some future Angkor Wat for future archaeologists to pore over. Structures such as those might survive at the surface for thousands of years, but not for many millions.
The Earth After Us: What Legacy Will Humans Leave in the Rocks?, Zalasiewicz

Só tive acesso a esta citação, mas o livro parece ser bem interessante. O autor, Jan Zalasiewicz geólogo de profissão, especula de forma sustentada sobre o que sobrará da passagem dos humanos daqui a 100 milhões de anos. E... basicamente nada. Todo o produto fruto de manufactura humana ficará diluído ou absorvido pelas forças da natureza. O tempo é uma coisa magnífica pois reduz-nos sempre à nossa insignificância...

LRO