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A. Rise of Dinosaurs Not So Rapid After All

Narrator: This is Science Today. A team of paleontologists from the University of California , Berkeley, the American Museum of Natural History and The Field Museum discovered fossils in northern New Mexico that show for the first time that dinosaurs coexisted with their non-dinosaur ancestors for tens of millions of years towards the end of the Triassic Period. Randy Irmis, a graduate student at UC Berkeley, co-led the excavation.

Irmis: We found a new species called Dromomeron romeri and the species is what is called the basal Dinosauromorpha. It's one of these dinosaur precursors and previously, similar species were only known from much older rocks in Argentina. So, this if the first time such an animal has been found in North America and the first time it's been found in the late Triassic. So, this really extends the range of this group of animals.

Narrator: Irmis says this discovery disproves previous notions that dinosaurs rapidly replaced their supposedly outmoded predecessors. For Science Today, I'm Larissa Branin.