The reason for the extinction of dinosaurs, the birth time of dinosaurs, and how many dinosaurs were

Dinosaur extinction took placeCretaceousPeriod.

The Cretaceous-Paleogene extinction event, because this extinction event completely destroyed the non-avian dinosaurs, is also commonly known as the "dinosaur extinction", formerly known as the Cretaceous Tertiary extinction event, which is the history of the earth.

The last mass extinction event is also the most famous mass extinction event in the general public perception.

The extinction event occurred 65 million years ago between the Mesozoic Cretaceous and Cenozoic Paleogene, with a dating error of 300,000 years, and wiped out most of the animals and plants on the earth at that time.

Including dinosaurs, in addition to dinosaurs, Cangosauridae, plesiosauridae, and pterosaurs.

Ammonite subclasses, as well as a variety of plants and invertebrates, also became extinct during this event.

Causes of the extinction of the dinosaurs:

Most scientists speculate that the extinction event was caused by one or more causes, such as an asteroid or comet.

impact events, or prolonged volcanic eruptions. Craters such as Chicxulub Crater and volcanic eruptions at the Deccan Dark Rocks, which are close to the time of the Cretaceous Paleogene boundary and are thought to be the most likely cause of this extinction event.

Impact events or volcanic eruptions release large amounts of dust into the atmosphere.

, shading sunlight and reducing the photosynthesis of plants.

This, in turn, has an impact on ecosystems around the world. But a few scientists believe that the extinction event occurred slowly, and that the cause of the extinction was gradually changing sea level and climate.

The dinosaurs were extinct during the Cretaceous period.

Dinosaur extinction refers to the mass extinction of life at the end of the Mesozoic Era in the Cretaceous period, which occurred about 65 million years ago. It is a diverse dominant vertebrate of the Mesozoic Era, dominating the world's terrestrial ecosystems for more than 100 million years.

Dinosaurs were a group of animals that lived about 100 million to 65 million years ago, and some of them were able to support their hind limbs to walk upright, and dominated the world's terrestrial ecosystems for more than 100 million years. Most of the dinosaurs have gone extinct, but the descendants of the dinosaurs, the birds, have survived and survived to this day. Dinosaurs first appeared about 100 million years ago in the Triassic period.

Dinosaurs appeared about 100 million years ago in the mid-to-late Triassic period of the Mesozoic Era.

The earliest and most primitive dinosaur found in the world is the archaeopterator, which lived 100 million years ago and the fossils were found in Argentina, South America.

Archaeraptor lived for a longer time than the Achilisaurus 100 million years ago, the fossil was found in Africa, when South America and Africa were still connected, this Achilisaurus is not a dinosaur in the real sense, it is a dinosaur form of a reptile, Achilisaurus is like a dinosaur, the skeletal structure is very similar to the dinosaur, but it is by no means a dinosaur, so it cannot be the ancestor of the dinosaur. The only possibility is Archaeraptor, whether from the structural structure of the pelvis, or from the analysis of its birthplace and living habits, Archaeraptor is a real dinosaur.

Archaeraptor has a body length of 1 meter, weighs 10 kilograms, has strong and powerful hind limbs, relies on three toes to support its weight, can run quickly, short forelimbs, sharp claws, can hunt prey, because its hind teeth have grooves and serrations, which is a typical carnivorous dinosaur teeth, the front teeth are leaf-shaped, with obvious herbivorous dinosaur teeth, so it is speculated that Archaeraptor was an omnivorous dinosaur, Archaeopterac has the characteristics of both later sauropods and later theropods, Archaeopterosaurus was probably the common ancestor of sauropods and theropods, and indeed all dinosaurs, so it was also the most primitive dinosaur.

The dinosaurs became extinct at the end of the Cretaceous period of the Mesozoic Era, about 65 million years ago.

The cause of the extinction of the dinosaurs is still being studied. For a long time, the most authoritative opinion was that the extinction of the dinosaurs was related to a large meteorite 65 million years ago. According to research, there was an asteroid with a diameter of 7-10 kilometers that fell on the surface of the earth, causing a large **, throwing a large amount of dust into the atmosphere, forming a dust fog that obscured the sky and the sun, causing the photosynthesis of plants to temporarily stop, and the dinosaurs became extinct.

The asteroid impact theory quickly gained support from many scientists. This view was further confirmed by the discovery in 1991 of a meteorite impact crater in Mexico's Yucatan Peninsula and the discovery of a very thin layer of iridium in strata of the same geological period (iridium is found in very small quantities on Earth). Today, that view seems to be a foregone conclusion.

About 100 million years ago in the middle and late Triassic period, extinct in about 6500 years ago, at the end of the Cretaceous period in the Mesozoic Era.

Dinosaur extinction is the Cretaceous period.

The Cretaceous-Paleogene extinction event was a large-scale species extinction event in the history of the earth, and it is also the most famous mass extinction event in the general public perception.

The extinction event occurred 65 million years ago between the Mesozoic Cretaceous and the Cenozoic Paleogene, with a chronological error of 300,000 years, extinct most of the animals and plants on the earth at that time, including dinosaurs, in addition to dinosaurs, cantosaurs, plesiosaurs, pterosaurs, ammonite subclasses and a variety of plants and invertebrates were also extinct in this event.

Dinosaurs were extinct twice, the first was the Jurassic mass extinction, but only a small part of it was the extinction of the dinosaurs in the late Cretaceous period, about 65 million years ago.

Although dinosaur fossils have been on Earth for tens of millions of years, it wasn't until the 19th century that people knew that such a strange animal once existed on Earth. The first dinosaur fossil was discovered by a British physician named Gideon Mantel, and the term "dinosaur" was coined by British paleontologist Richard Owen.

In 1842, the British paleontologist Sir Owen coined a name for them in Latin, which consists of two roots, the first root meaning "terrifying" and the second root meaning "lizard".

65 million years ago.

There are various theories about the cause of the extinction of the dinosaurs, the most popular one is that an asteroid hit the earth and caused a large number of green plants to extinct it, and the dinosaurs had no food**, or even extinction, but archaeological studies have shown that the extinction of the dinosaurs lasted for 1 million years.

The heyday of dinosaurs was in the Jurassic and early Cretaceous, but the fossilized dinosaur eggs only appeared in the late Cretaceous, which indicates that it is likely that in the Jurassic and early Cretaceous, the incubation of dinosaurs was normal, and in the late Cretaceous, they may have encountered some irresistible factors in Qingyin that caused the incubation to not be carried out, and this situation continued, and there were fewer and fewer new dinosaurs until they finally became extinct.

In the 80s of the last century, scientists proposed that dinosaurs may have gone extinct during an asteroid impact event. At the time, this was a very bold idea and caused a lot of controversy.

In 1991, geologists discovered the remains of an impact crater about 180 kilometers in diameter on the Yucatan Peninsula in Mexico, North America, which they believe was the site of the asteroid impact.

What year did the dinosaurs go extinct? The answer is that the dinosaurs became extinct about 65 million years ago. Dinosaurs first appeared in the Triassic period about 240 million years ago and died out in the Cretaceous period about 65 million years ago during the late Cretaceous mass extinction event of the Mesozoic Era.