Age of dinosaurs
The Triassic age, 252-200 million years ago, saw the appearance of first reptiles and dinosaurs. The Jurassic age, 200-145 million years ago, saw the appearance of birds and mammals. In the Cretaceous age, 145-66 million years ago, some well-known dinosaurs appeared: Triceratops and Pteranodon, the most advanced flora of the Middle Age, were the source of food for the largest dinosaurs, such as Argentina's, where it weighed 80 tons according to a 2005 study in the journal Revesta del Muso Argentino,
It should be noted that not all dinosaurs lived in the same geological period; For example: The dinosaur Stegosaurus lived during the late Jurassic, Tyrannosaurus during the late Cretaceous and during the intermediate age a kind of non-flying dinosaur developed into flying dinosaurs.
dinosaur extinction
The extinction took place at the end of the Cretaceous period and the beginning of the Paleogene era. As a result, the dinosaurs disappeared, while most mammals, tortoises, crocodiles, and frogs survived. Scientists ascribe the cause of the extinction to two hypotheses. The first is an exogenous influence that originated and affected the planet, causing extinction, such as: Impact of a asteroid or comet on Earth, second hypothesis is a significant rise in volcanic activity.
Dinosaur Facts
There are many facts about dinosaurs, including:All non-flying dinosaurs went extinct about 66 million years ago, and there's about 700 known species of them, and modern birds are a kind of dinosaur, because they share some things with non-flying dinosaurs. Paleontologists have found evidence of extinct animals that they exist, such as: teeth and bones, along with evidence of animal activity, such as: footprints