Exactly. It’s absurd to think that over time animal bones ‘sink’ down 5000 feet as layers of rock and mud cover them. When you see dead animals by the side of the road, or a dead rabbit in your back yard, they are eaten very quickly by scavengers and bugs. Every bit of life and energy is taken out of them and their empty bodies dry up and dissipate. There aren’t layers of dead animal carcasses anywhere.

To account for this though, archaeologists have tried to claim that the scavenging bugs that ate the dead weren’t around yet. Which is how they were allowed to have massive pockets of dead matter gather and not be consumed.