The bulk of the “fossils” that fossilize to become potential fuel comprises vegetable matter—plant life—no?
The carbon plants use to grow, the carbon that allows grass to grow into the air as blades of grass, and trees to grow inyo the air as towers of wood, is inspired (breathed) in by those plants not from the soil, but from the surrounding air—oir atmosphere.
The very surface of the earth grows year by year like a layer cake in some lush areas such as rolling, grass-covered hills in southern England. Many times it’s why archaeologists have to use ground-penetrating radar and dig 10-15 feet to find the foundations of ancient roman buildings there.
It follows that periods of high CO2 or peak CO2 in the atmosphere will leave behind the richest veins of fossil fuels in the earth/in the ground.
Please see my #25.
Please see my #25. Am I incorrect?
There are several theories about how petroleum deposits are formed. One is that organic material in sedimentary rock layers forms petroleum. Another is that anerobic bacteria lives on hydrogen gas, hydrogen sulfide gas and carbon dioxide gas leaking from the interior of the earth and produces hydrocarbons.
There are oceans of hydrocarbons on the moons of Jupiter and Saturn (and many other places). I doubt that there were ancient savannas and forests on these moons.