What are the prehistoric dinosaurs In which period were the dinosaurs first located

Dinosaurs appeared during the Triassic period.

During the Triassic, vertebrates were further developed. Among them, the appearance of alveolar reptiles, and from the development of the earliest dinosaurs, the late Triassic, lizards and ornithischians have many species, dinosaurs are already a wide variety of groups, occupy an important position in the ecosystem, therefore, the Triassic is also known as "the dawn of the dinosaur generation".

According to the analysis of earth experts, continental drift can cause a series of environmental changes, which in turn can cause climate change. When the southern continents are separated, the newly formed ocean surface is also raised. This causes all the sea** and the ocean to expand to the land, and most of the land is covered by shallow seas.

The oceans have a huge impact on climate change, and when the ancient continents were not separated, the temperature on the earth was almost the same from the equator to the poles, and the temperature difference was not much different. However, by the late Cretaceous period, the sea receded, the climate changed, and the polar regions became colder, while in other regions, it became a temperate climate with alternating cold and heat, which provided the external conditions for the extinction of dinosaurs adapted to the warm climate. The dinosaurs could not adapt to this change and slowly became extinct.

It is known that dinosaurs ruled three geological epochs for a total of 165 million years. However, during the Triassic and early Jurassic periods, dinosaurs still did not become a very powerful species, almost completely dominating the entire evolutionary process of animals. By the end of the Jurassic period, very large sauropods had become the largest creatures ever on Earth.

The end of the Jurassic period was the peak of their domination of the earth, and they far surpassed other creatures of the same period in terms of diversity, intelligence, and size. How did the most legendary species in the history of the earth come to be, and how did it rise? Before the advent of dinosaurs, lizard-type species had appeared on the earth, and although they were not as large as dinosaurs, they had a certain advantage over other animals at that time.

Paleontologists believe they were the prototypes of the dinosaurs that came later. Lizards appeared in several geological epochs before the Triassic – the Carboniferous period (100 million to 100 million years ago). In that time appeared what is believed to be the world's first reptile :

West Lothian lizard. By the Permian period, a geological epoch before the dinosaurs, reptiles were becoming more diverse and closer in shape to those of the earliest dinosaurs. The Permian was a relatively arid era, and deserts were common.

During the same era, lizards living in groups like the Ichirasaurus and Heterodontosaurus were active in desert oases. During the Late Permian, there were two distinct trends in the evolution of life, both of which had profound implications for the history of the Earth. One of these trends is called dinosaurs, and the other is called mammals.

Just as Earth's evolution was in full swing, an asteroid larger than the meteorite that ended the age of dinosaurs 65 million years ago hit Earth at the end of the Permian period. The impact caused the extinction of most species, but it also served as a catalyst for the emergence of dinosaurs. During the Permian period, the real dinosaurs were about to make their official debut.

One of the earliest dinosaurs to appear, the Black Reisaurus was small and agile, quickly becoming a big winner in survival games. By the end of the Permian, the Cavinosaurus appeared, which was the prototype of many carnivorous dinosaurs and birds. Soon in the Jurassic period, the early Jurassic herbivorous dinosaurs began to evolve in size, and the advantage of size could help them escape the pursuit of carnivorous dinosaurs.

Hence the emergence of sauropod dinosaurs; The huge sauropod class pushed dinosaur evolution to its highest peak. Another reason for the emergence of large sauropod dinosaurs is the climate, according to geological records, the late Jurassic period was warm and humid, and dinosaurs could grow to more than 30 meters long. In addition, carnivorous dinosaurs have also become larger, more aggressive and threatening; For example, Allosaurus in North America.

In addition, very special dinosaurs, such as the feathered Chinese dragon bird, began to embark on the path of bird evolution. Under the influence of climate and living conditions, the end of the Jurassic period was the heyday of the Dinosaur Age.

Ornithosaurus was the first dinosaur fossil to be discovered. It was discovered in 1822 by the Mantels of England. Before this, some people in Europe have also discovered, but they do not know where they belong and have always been mistaken for the remains of giants. The first dinosaur to be named was the avianthosaurus.

Appeared in the Triassic and Early Jurassic.

Dinosaurs were reptiles that appeared 245 million years ago and flourished at the end of the Mesozoic Era 65 million years ago. Or a vague general term for dinosaurs and their contemporaries, plesiosaurs, pterosaurs, etc. The sudden disappearance of dinosaurs at a certain time has become a mystery in the history of the evolution of life on Earth, a mystery that no one has solved to this day.

All of the earth's past creatures are recorded in fossils. In the strata of the Mesozoic era, many dinosaur fossils have been found. A large number of bones can be seen in a variety of shapes.

However, in the Cenozoic strata that followed, there were no dinosaur fossils at all.

Dinosaurs were a type of reptile from the Mesozoic era, with sturdy limbs, long tails, and large bodies that portrayed most dinosaurs. They mainly inhabit woodlands or open areas on lakeshore plains. In 1841, when the British scientist Richard Owen studied several fossilized lizard bones, he thought they were left by some prehistoric animal, and named them dinosaurs, which means"Scary lizards"。

The dinosaurs suddenly disappeared at the end of the Cretaceous period 65 million years ago, becoming a mystery in the history of the evolution of life on Earth, which no one has solved to this day. All of the earth's past creatures are recorded in fossils. In the strata of the Mesozoic era, many dinosaur fossils have been found.

A large number of bones can be seen in a variety of shapes. However, in the Cenozoic strata that followed, there were no fossils of non-avian dinosaurs at all, which suggests that non-avian dinosaurs became extinct together during the Mesozoic Era, and that only birds remain today, which most scientists recognize"Birds belong to dinosaurs"said. There are many types of dinosaurs, and their body shape and habits also vary greatly, with the largest fragile dinosaur being more than 50 meters long, while the smallest hummingbird may be less than 10 centimeters.