In the event that a future civilisation decides to excavate the earth, perhaps millions of year from now, they will find a unique layer where humans once were. They might find the signs of hardy industrial processes, such as plastics. They will doubtless find other manufactured remains, or the ghosts of those manufactures. They will also find radioactive products from the man-made nuclear era. It will be a very different stratum to those that preceded it, one in which the Earth was changed over a brief period and by quite artificial means, all at the hands of humans.

Not to be a pessimist but I think it's doubtful that the descendants of humans will be amongst those future explorers and scientists, our time having run its course, the evidence all too apparent in the stratum.