Smithsonian Magazine on MSN
Sharklike fish with weird, buzz-saw jaws sliced through the seas, then vanished. Now, paleontologists are unraveling their secrets
The fossil whorls were a mystery. In 1899, geologist Alexander Karpinsky described an odd spiral of teeth, the first known fossil of its kind, uncovered from the ancient rocks of Krasnoufimsk, Russia.
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