"A few hundred years will be indistinguishable from a single human lifetime to those future geologists."
On what do you base this claim? Before humans, not much happened around and the sediment layers were thin. The amount of energy moving things around was limited to weather (due to sun radiation, mostly), volcanic/tectonic activity, and to (a lesser degree, due to direct effect of) tidal forces. Humans activity however, both directly and indirectly, caused effects that also involved energy stored in the span of millions of years. That should be anything but indistinguishable.
Also, from the article:
"The amount of sediment settled behind the world’s thousands of big dams would cover all of California to a depth of five meters, and such sediments are full of distinctive markers, like pesticide residues, metals, microplastics and the fossils of invasive species. To define a time period formally, geologists must identify distinctive signals in sediments or rocks that can be correlated around the globe, and the presence of such markers is ubiquitous. The geology is real."
> like pesticide residues, metals, microplastics and the fossils of invasive species.
How much of that stuff is going to survive on geological timescales amd the concept of "invasive species" isn't really applicable to anything but conservationists that want to maintain a static environment.
On what do you base this claim? Before humans, not much happened around and the sediment layers were thin. The amount of energy moving things around was limited to weather (due to sun radiation, mostly), volcanic/tectonic activity, and to (a lesser degree, due to direct effect of) tidal forces. Humans activity however, both directly and indirectly, caused effects that also involved energy stored in the span of millions of years. That should be anything but indistinguishable.
Also, from the article: "The amount of sediment settled behind the world’s thousands of big dams would cover all of California to a depth of five meters, and such sediments are full of distinctive markers, like pesticide residues, metals, microplastics and the fossils of invasive species. To define a time period formally, geologists must identify distinctive signals in sediments or rocks that can be correlated around the globe, and the presence of such markers is ubiquitous. The geology is real."