"Lahey, I live in a tent!"
To take the Bible at its word, we have to believe that before the Flood, the earth had the same total quantity of water that it has today but that most of it was underground. We have something like this underground now, petroleum. Crude. Sometimes the crude is under pressure and all you have...
Obviously, in my estimation.
Story goes, that every creature which lived on the land, and every bird, except for Noah and his family and all the species on the ark, perished in the Flood.
All those dead creatures.
So there ought to be lots and lots of fossils!
And there are!