this. oil and gas source rock is basically marine algae within shale from a long fn time ago...its what the frackers fracture to get the btus to flow out. That dinosaur to gas tank image was from commercials from the early 70s...Most of the fossil fuel material we use today comes from algae, bacteria, and plants—some of which date back even before the Devonian Period, 419.2 million to 358.9 million years ago. Consequently, at least most of the time, you are not pouring refined dinosaur parts into the gas tank of your vehicle.