Couldn't it be possible there are layers that we've explained as having natural causes simply because when discovered, those attempting to explain them didn't e

Couldn't it be possible there are layers that we've explained as having natural causes simply because when discovered, those attempting to explain them didn't even consider the idea it was caused by a civilization? We're already seeing life adapt to plastics with enzymes that break them down. Perhaps the layer we leave will look more natural than we're assuming.