Scientists Discover the Oldest Dinosaur Yet...Maybe

A cross-section through the outer portion of the cortex shows the deltopectoral crest, among other indicators. Paleontologists in Tanzania have unearthed fossils from a new species of prehistoric reptile. The bones may have belonged to the world's oldest dinosaur---or they may be from a reptile that kind of looks like a dinosaur. Currently, the oldest confirmed dinosaur fossil dates back 230 million years. By this point in time, dinosaurs had grown in size and population to dominate the Earth. But when exactly did dinosaurs first enter the prehistoric picture, and how long did it take them to rise to such prominence? Paleontologists have narrowed the timeline down to the early or middle Triassic---the period of 20 million years before the oldest known dinosaur came to be. The newfound species, dubbed Nyasasaurus parringtoni, predates this fossil by another 10 to 15 million years, and falls right in the middle of paleontologists' ...