Depends how long dead we’re talking about. You might like this paper[1] which asks what evidence would be left if there had been a pre-human industrial civilisa

Depends how long dead we’re talking about. You might like this paper[1] which asks what evidence would be left if there had been a pre-human industrial civilisation. [1] https://arxiv.org/abs/1804.03748 https://arxiv.org/abs/1804.03748