Catagenesis Oil Origin
Uh, I don’t think that is the case.
I know that coal is the result of large trees that fell during the Carbonaceous period and were buried by natural soil action. Since the bacteria that causes the rotting of wood hadn’t evolved then, these trees piled up upon one another, eventually became covered with soil, then metamorphosed through heat and pressure to become coal.
As for petroleum, long before animals as we know them came upon the earth or swam in the seas, the oceans had life in the forms of simple algae. ( Fossilized algae have been discovered in rockes older than 500 Million years old.)
This algae bloomed throughout most of the world’s oceans and was the source of the oxygen we breathe. When algae died it sank to the sea floor and piled up. This accumulation of dead biomass from millions of years of accumulation eventually became petroleum.