oldest form of an actual shark fossil ever accepted were calcium phosphate teeth, originating from about 418 million years ago. The oldest complete shark fossil found is that of Doliodus problematicus, which was dug up in full-body form, including brain case, jaws, and fins, at a New Brunswirk, Canada site. Estimated to live about 409 million years ago and growing to be between only 50-70 centimeters, this ray-like bottom dweller would have been found in most temperate and tropical oceans during the…
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