The Early Jurassic World was a very uniform one. After the extremes of heat and drought that characterized the Triassic, a brief period of global cooling had reduced their therapsid and croc-line competitors to a handful of small mammals and lizardlike creatures and allowed the formerly restricted dinosaurs to spread throughout the world (Dunne et al). With the continents joined together, there were no major barriers to their dispersal, and so for the first time in dinosaur history, faunas the world over looked much the same (Holtz). Some faunal elements would have been familiar, if rare, parts of a Late Triassic ecosystem: long-tailed pterosaurs in the air, ichthyosaurs and plesiosaurs in the sea, bipedal prosauropods and small coelophysids on land. Others were more novel: elephant-sized sauropods, bipedal and armored ornithischians, and hunting them all, the first truly large (6m+), apex-predator theropods.