What are Some Triassic Organisms?

The Triassic is a geological age ranging from 250 million to 200 million BC. It lies between the Permian and Jurassic and is the first Mesozoic. The beginning and end of the Triassic are marked by an extinction event.

During the Triassic, most of the continents on Earth formed a huge continent:

The thriving age of gymnosperms

The Triassic is the first period of the Mesozoic, and the beginning of the modern biomes after the extinction of the Paleozoic biomes

Triassic

Formation of the transition period. Significant changes have taken place in marine invertebrate groups. Endophytic, swimming molluscs-crustacean communities have replaced epigenetic, fixed brachiopods-sea lily communities to become dominant communities in the ocean; six-radial corals have replaced four-radial corals, and Rapid development and global reach. Compared with the Paleozoic, bivalves and chrysanthemums are also more newly developed species, and chrysanthemums often have complex patterns and chrysanthemum-type sutures.

During the Triassic, vertebrates were further developed. Among them, slottooth reptiles emerged and developed the earliest dinosaurs from it. In the late Triassic, there were many species of sauropods and ornithopods. Dinosaurs are already a large group of species. In the ecosystem Occupies an important position Therefore, the Triassic is also known as "the dawn before the dinosaur generation". At the same time, the earliest mammals-mammal-like reptiles-evolved from beast-hole reptiles, but in the long years that followed from Jurassic to Cretaceous for more than 100 million years, At all times mammals have been living in the shadow of dinosaur-based reptiles, and it was not until the Cenozoic that they dominated the earth.

The early Triassic plants were mostly drought-resistant. As the climate changed from semi-dry heat and dry heat to warm and humid, the plants tended to flourish. On the low hills and gentle slopes, evergreen trees like pine, Cycads, etc., and the main flora that were abundant in the Paleozoic era almost all went extinct. ^[3]

Biological change

Triassic ----- Creature (2 photos)

Extinction event

The Triassic ended with an extinction event, especially for marine life. It was devastating: the tooth-shaped stone became extinct and all marine reptiles except ichthyosaurs disappeared. Invertebrates such as brachiopods, gastropods, and shells have been hit hard. In the ocean, 22% of the genus and about half of the species disappear.

The extinction was not equally devastating everywhere. In some places it has almost no effect. In some other places virtually all of the dragons and most of the arctoss disappeared. Many early dinosaurs also became extinct, while those that were more developed survived. Many molars have also become extinct. Surviving plants include conifers and cycads.

The cause of the extinction is unclear. The Pangu continent began 20 to 213 million years ago

Triassic (3 photos)

The division, which led to a strong volcanic movement, was the strongest volcanic movement since the formation of the Earth's continent. Other possible causes are global climate cooling or meteorites. A crater in Quebec, Canada was once thought to be the cause of the extinction event, but subsequent investigations have suggested that the crater formed 214 million years ago, 120 ± 200,000 years before the end of the Triassic , So it is unlikely to be the direct cause of this extinction event.

Not even the exact time of the extinction is certain. Some studies have suggested that there were actually two extinction events at that time, with an interval of 12 to 17 million years. This extinction event provided a huge opportunity for the development of dinosaurs. Dinosaurs will be the most important, most diverse and largest group of animals on Earth for the next 150 million years.