Word: pangea
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Dates: during 1980-1989
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...first led scientists to the area in northwestern Argentina where the bones were found. Smaller than Apatosaurus and less fearsome than Tyrannosaurus, this dinosaur flourished 230 million years ago during the unique period when most of the earth's landmasses were gathered into a single supercontinent, now called Pangea. Until the most recent find, only a smattering of Herrerasaurus bones had been unearthed. Now scientists will be able to look over the complete skeleton for important evolutionary clues. While Herrerasaurus is not the long sought common ancestor of all dinosaurs, notes Sereno, "it's close -- and maybe...