If petroleum is formed from squished animals why aren't a lot of bones found in the oil deposits?

Question

If petroleum is formed from squished animals why aren't a lot of bones found in the oil deposits?

Answer 1

It's just a theory that oil was formed from ancient lifeforms, be it algae, plankton or dinosaurs.

However, if oil really is "fossil fuel," and Earth is the only planet with lifeforms, then no oil will be found on any other planet.  Ever think of that?  So we'll really need another fuel source as your great grandkids explore the galaxy ... and maybe that pop bottle you drink from today will be more rare than platinum in the future.

Answer 2

The animals are small and boneless: they include micro organisms such as algae and plankton, as well as various shellfish (mostly brachiopods and molluscs) aquatic plants and various invertebrates (worms etc) The shells are usually found in the same rock formations as fossils.

Answer 3

Actually oil in the ground is mostly the product of decomposing plankton.  Plankton are microscopic single celled animals that live in water.  Over time, and with some heat coming from the earth, the remains of these plankton break down into crude oil.  There are oils that have formed from other materials such as leaves, trees, algeas and the like, however, the vast majority come from the simple plankton in our waters.