the continents drifted into their present configuration

Or there's the Eocene, more than 34 million years ago,a hothouse time during which the continents drifted into their present configuration.Changes in climate or fossils found in the rock record help distinguish these epochs and help geologists tell deep time.So what will be the record of modern people's impact on the planet?It doesn't rely on the things that may seem most obvious to us today,like sprawling cities.