00:05ancient sea monster fossil reveals early mosasaur from utah's prehistoric ocean in the ancient
00:11western interior seaway warm ocean water once covered utah kansas colorado and huge stretches
00:16of north america paleontologists studied tiny mosasaur bones from southern utah where gray
00:21shale preserved a predator smaller than later giant marine reptiles the new mosasaur had paddle-like
00:27limbs a long body and sharp teeth built for chasing fish through cretaceous sea water researchers named
00:33the fossil cerebasaurus dolly connecting the animal to utah's desert rocks and the ancient sea that once
00:38covered them cerebasaurus swam about 94 million years ago making it one of the oldest known mosasaurs
00:43found in north america later mosasaurs grew into massive ocean hunters but cerebasaurus shows an
00:49earlier body plan still changing toward full marine life the fossil skull and bones helped scientists
00:54compare teeth limbs and vertebrae with younger mosasaurs from other cretaceous seas southern
00:59utah's shale layers now hold clues from fish shells marine reptiles and muddy seafloor that vanished
01:05millions of years ago the discovery shows how small fossil fragments can reveal a predator that swam before
01:10the famous giant mosasaurs ruled the water in utah desert stone one ancient jaw can bring a lost north
01:16american sea back to life
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