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Did dinosaurs become oil

I don't know if this has been mentioned yet, but just because oil is found in,
say, Miocene sediments it doesn't necessarily mean that the oil itself is of
Miocene age. Oil will migrate upwards, courtesy of its low density, to become
trapped below impervious rocks. For example, several large oil fields that are
tapped from the Jurassic rocks of the North Sea migrated through the rocks
below. The source is thought to be underlying Carboniferous strata. No 
dinosaursinvolved in this case.