I thought oil was the remains of decomposed marine microorganisms, rather than bits of dead reptile (but then I'm a physicist, not a biologist!).
your'e right of course Kev, I just liked the symmetry of his argument! ha ha
Maybe there's scope for a range of plastic pre-cambrian plankton toys?
H ah, there already is one! Plankton fro Spongebob! https://images-eu.ssl-images-amazon.com/images/I/51%2BQu-ZAhIL._SS500_.jpgIn a bizarre twist in the tale, I read on the New Scientist site that plankton has been filmed eating plastic in the sea!