[VadeRetro]

Our major oil fields are in the middle east deserts, where plants and vegetation, dinosaurs were never present to decay and lay down an oil field because its all sand. Next are the Arctic ones in Alaska, where vegetation is slow growing tundra. Not enough bionic activity there to account for the vast deposits. Next tell me how the plant/dinosaur residue that you say was the foundation of oil formation gets some 5000ft down and deeper into the earth through a rocky mantle where it can be pumped to the surface in such great abundance?

This is naive. Not only is the Earth old, but what used to be desert was once jungle and sometimes vice-versa. Quite a lot of things were different back in the Cretaceous. Antartica wasn't always at the South Pole. Plate tectonics and all that.

[RightWhale]

The bio theory is interesting and there might be something to it, but it is slow. It is possible there are some deep pools, but generally some kind of impermeable cap would be needed to trap and collect the oil and gas, so goes the oilman's theory, and that is probably more likely near the surface where geological layers form by sedimentation than deep. Besides that, we are certainly producing oil much faster than it formed.

[brainstem223]

Plate tectonics explains the formation of mountain ridges but has no answer for the formation of all that sand that deserts contain. How did the Sahara desert fill up with vast quantities of sand?