Dinosaurs And The Past Triassic Period - www.informationsecuritysummit.org

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The dinosaurs roamed the earth for more than million years. Over this time period, known as the Mesozoic era, the Earth was subject to a lot of change in terms of landscape, climate, flora and fauna. It was a volatile and fertile time, with several natural disasters causing the extinction of many of the. Frizzle-inspired by an archeological dig-craves a more authentic experience. The Magic School Bus turns into a time machine and transports the class back millions of years to an adventure where they learn about dinosaurs, their habitats and diets, and even a Maiasaura nesting www.informationsecuritysummit.org: Scholastic, Inc. Dinosaurs And The Past Triassic Period

For decades, South America has been regarded as the place where dinosaurs originated. Prior to the appearance of dinosaurs in the middle Triassic, smaller dinosaur-like animals scurried about within the jungles of South America.

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They first appeared during the early Triassic Period, and continued into the late Triassic, well after dinosaurs had appeared and established themselves. Probably the most well-known of these Padt dinosauromorphs is Lagosuchus. Unlike other reptiles alive at the time, Lagosuchus and its kind ran around on two legs instead of four. This would be a major innovation which would be exploited by the earliest dinosaurs.

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For a long time, our idea of what the earliest dinosaurs looked like was shrouded in mystery. However, it seemed that the first dinosaurs were carnivores. From the s until the very Triasaic s, creatures like Staurikosaurus and Herrerasaurus were thought to be the oldest-known dinosaurs. These were fairly large animals — Staurikosaurus reached 6 to 8 feet long, and Herrerasaurus was even bigger, reaching 12 feet source.

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Both of these animals clearly would have been formidable competitors to the other carnivorous four-legged reptiles which were alive at the time. This was quite an upgrade from small chicken-sized creatures like Lagosuchus within a very short length of time. Was it possible that there was another dinosaur, as yet undiscovered, which could fill the gap between the primitive dinosauromorphs and creatures like Herrerasaurus? Inthe skeleton of a new dinosaur was discovered in Argentina by Dr. Ricardo Martinez, a paleontologist from the University of San Juan. This animal was far smaller, and it seemed more primitive, than Herrerasaurus. Inthe animal was named Eoraptor.

For nearly two decades, this little animal, measuring just 3 feet long, held the title of being the oldest-known dinosaur. However, complications arose. A closer examination of the skeletons of both Herrerasaurus and Eoraptor created doubts as to whether or not Eoraptor really was the oldest and most primitive dinosaur ever found. Eoraptor possessed three sacral vertebrae, but Herrerasaurus had only two.]