Our geologic legacy

The Anthropocene is still getting started, but it’s unlikely to last forever–either we’ll transform ourselves or make ourselves extinct. In 50 million years, what will be left? Probably just a few centimeters of geologic debris:

We note that effective sedimentation rates in ocean sediment for cores with multi-million-year-old sediment are of the order of a few cm/1000 years at best, and while the degree of bioturbation may smear a short-period signal, the Anthropocene will likely only appear as a section a few cm thick, and appear almost instantaneously in the record. – The Silurian hypothesis: would it be possible to detect an industrial civilization in the geological record?