mike you and many People are Missing how Evolution works! A creature Mutates (like no 2 people are alike) Certain Mutations are able to adapt better Example: I am over weight however I don't eat alot. this would be great in a time when food is not plentiful. I am able to store what I take in better then you might. and Back along time ago I would be the one to survive. this is Basically how it works.
ok now in the case of Sharks NONE of the species are the same as the fossils you mention. they have Evolved!!!! but not as much as we did. Sharks are very well adapted to where they live so no Mutation is going to be favored over another. so they change very little. I suspect with our modern world the same will go with Humans now because we deal with health Problems we have (like my weight problem)
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