Name:__________________ When Dinosaurs Lived Dinosaurs lived millions of years ago. Scientists call the time when dinosaurs lived the Mesozoic Era. The Mesozoic Era is divided into three parts: the Triassic Period, the Jurassic Period , and the Cretaceous Period. The timeline below shows some dinosaurs that lived during each of those periods. 200 TRIASSIC PERIOD 180 JURASSIC PERIOD 135 CRETACEOUS PERIOD 65 Millions of Years Ago Directions: Study the timeline. Complete the sentences. 1. Dinosaurs first lived during the _________________________ Period. 2. __________________ lived during the Jurassic Period. 3. Utahraptor lived during the _________________________ Period. 4. Oviraptor lived early in the _________________________ Period. 5. __________________ lived later during the Cretaceous Period.