Jurassic dinosaurs introduction scroll down to see the dinos the jurassic period is the second of the three periods of the mesozoic era at the end of the preceding period the triassic period there had been a mass extinction of species this was probably caused by widespread volcanic activity. Dinosaurs during the jurassic period relatives of the small quadrupedal plant eating prosauropods of the triassic period gradually evolved into multi ton sauropods like brachiosaurus and diplodocus this period also saw the concurrent rise of medium to large sized theropod dinosaurs like allosaurus and megalosaurus. The jurassic period was the second segment of the mesozoic era it occurred from 1996 to 1455 million years ago following the triassic period and preceding the cretaceous period. The jurassic life is the time period of 203 to 135 million years ago evolution has begun to develop excessively not only for dinosaurs either flying creatures called pterosaurs started to soar in the air the dinosaurs of the jurassic era were very large but there were a share of smaller ones as well
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