Question....where is the extra dirt coming from?

[rusty JEDI]

Lets say you are hunting for dinosaur fossils or on some archaeological dig.

In canada you dig down.

In Africa you dig down.

In Asia you dig down.

Where the hell is all this extra dirt coming from. There must be a lot more dirt on earth that there was 1000's of years ago fi you always have to dig to find anything. It cant all be from meteorites?.

Are the oceans getting deeper and its coming from down there?

Seriously i cant figure it out.

rJ