Apatosaurus (also known as brontosaurus) and Stegosaurus are from the Jurassic period, and Tyrannosaurus Rex and Triceratops are from the Cretaceous period. The extinction of dinosaurs is believed to have been caused by the Cretaceous-Tertiary extinction event (also known as the K-T extinction event). These dinosaurs have all been momentarily brought here together until the next G-I (gastrointestinal) extinction event. Who knew that human consumption is the real reason why dinosaurs became extinct!!!
Even though dinosaurs are now extinct, people will always appreciate the sublime beauty of such magnificent creatures and continue to adore them. ;)