There are no dinosaurs, or land animals of any kind, in oil. It's sort of interesting how a myth so completely wrong is so widespread.
It's made out of microscopic dead marine algae. The biomass of marine algae is beyond belief. Actually, if all the oil that ever formed still existed, gas would be a penny a gallon; the overwhelming majority of it has been destroyed or escaped to the surface; the key thing is getting it trapped underground.
I wonder why the dryer always gets blamed. How do we know it's not the washer or the hamper?
There was a science fiction short story many years ago with the premise that all those extra hangers, socks, etc. that accumulate are a form of mimicry by alien life forms, like a walking stick insect. Wish I could remember the author, Laumer, Leiber, Kornbluth, Sturgeon, hmmmmm...story had a somewhat sinister twist too, watch out for those spare socks!
((((PING))))
That was the problem in the valve guide seals in my Chevy. Bits of dinosaur bones would get stuck in there and chew up the seal and next thing you know the Chevy is burning oil.
There were alot of dinosaurs, and the plants the herbevoires amoung them ate. However the other factor is that they, the dinosaurs and the plants, were around for a long, long time.
"Of course, I often wonder where all my extra coat hangers come from too...I think socks are the embryonic form of a coat hanger, 'cause everytime I lose a sock in the dryer, I find more coat hangers around. Hummmmmm"
Obviously we need an abiotic theory of coathanger formation. Time to call the Russians.
Nope. Paper clips are embryonic coat hangers
Plankton. Most oil is sourced from rocks which contains the remains of microscopic marine life. A good source rock might contain 1-2% organic material by weight. Extremely prolific source rocks, like the Monterey Formation of California contains up to 20% organic material by weight. It literally bleeds oil.