Silurian Hypothesis
It’s true that only very few individuals would be fossilised and fewer if they found. Nevertheless we do generally find multiple fossils of the same or closely related species. We also find fossils of multiple stages in the evolution of many species. So it seems unlikely to me that we would find zero fossils of a species advanced enough to colonise the entire planet, as we have, nor any of their ancestral species.<p>It also seems likely that technological artefacts would leave fossil-like impressions, or for mineral objects like ceramics simply straight up survive in strata. Such artefacts would massively exceed the number of individuals and trash has a tendency to get widely distributed so it seems extremely unlikely none would be found.<p>One idea is that they might have only lived in a small geographic region such as an island, and if that location happened to subduct and not reach the surface we’d never find them. Well yes, but the major advantage of technology is that it allows you to overcome geographic and climatic barriers, which is why us hairless tropical plains apes have colonised every region on the planet, and did so everywhere except Antarctica but including the arctic with Stone Age technology. An industrial society would also create demand for resources, prompting global expansion.<p>So it’s an interesting thought experiment, but I just don’t see how the hypothesis is really viable. Not impossible perhaps, but extremely low likelihood to the point of implausibility IMHO.