The old saw about oil being liquified dinosaurs is kind of... overwrought, as well. Oil deposits, if they truly are "fossil" fuels, almost certainly derived from plant material, not huge concentrations of dinosaurs.
Oh sure, now
plants somehow traveled the stars.
You want to tell me how a ficus could even steer a starship, let alone build one capable of starting colonies on Titan and carrying more of them out beyond the solar system to become the interstellar benzene?