“Gee, now how did all them dinosaurs and plants get up there to die and leave us all this oil? /s”
Bingo! I propose that whoever uses the term “fossil fuels” should be set straight!
All crude oil contains microfossils.
USING MICROFOSSILS IN PETROLEUM EXPLORATION
http://www.ucmp.berkeley.edu/fosrec/ONeill.html
It isn’t from dinosaurs. It is sediment from oceans and a few lakes. Plankton, algae, etc get trapped in the sediment away from oxygen that would fully decompose the organics. Just as we can squeeze oil out of new algae, complex hydrocarbons are left in the sediment.