Why is the Triassic called Triassic, there are Permian, Triassic, why is there no Assimic?

Because German geology is divided into three layers.

Triassic names**.

Japan was the first to translate the Greek word trias as Triassic, and this name is used by the geological community in China. The strata formed during this period are called Triassic and are represented by the symbol t. The Triassic is divided into three epochs: Early, Middle and Late.

In terms of biological transformation, terrestrial reptiles have developed significantly compared to the Permian. Representatives of the ancient types (such as the Apodona and the Hypocones) are basically extinct, and new types appear in large numbers, and some of them are transferred to the sea for life. Protomammals also appeared at the end of the Triassic.

Due to the expansion of land area, freshwater invertebrates have developed rapidly, and the appearance of marine invertebrates has also been renewed. Ammonite, bivalves, and foraminifera became important phyla to divide and contrast strata, while the squirt and tetracephalic corals were completely extinct.

Reptiles rose in the Triassic and consisted mainly of alveolars, dinosaurs, and mammal-like reptiles. The typical early alveolar tooth exhibits many primitive features and is confined to the Triassic, and its general structure is the ancestral pattern of later major reptiles and even birds; Dinosaurs first appeared in the Late Triassic and had two main types: the older sauropods and the more evolved ornithischians.

Marine reptiles first appeared in the Triassic, and due to their adaptation to life in the water, their body shape is streamlined, and their limbs have also become paddle-shaped fins; Mammal-like reptiles, also known as therapids, move their limbs ventrally, making them more suitable for walking on land.

The primitive mammals were first seen in the Late Triassic and belonged to the class of Archaeoptae, and the fossils seen were fragments of teeth and jaws. During the Triassic, a large number of surviving odontomonites from the Late Permian flourished, and most of the ammonites of the Middle and Late Triassic had developed ornamentation, and there were many families that were unique to the Triassic. The rapid evolution of ammonites created extremely important conditions for the division and comparison of strata.

There are also significant changes in bivalves, with only a few species from the Late Paleozoic continuing to exist, giving rise to many new species, and quite numerous in number. Especially in the Late Triassic, the structural types of some species became complex, and the individuals were often larger. Because the environment of the Triassic was different from that of the Paleozoic, non-marine bivalves gradually flourished.

Gymnosperm cycads, bennecytes, nilsan, ginkgo biloba and pine and cypress developed rapidly since the Triassic. Except for the Cycad order, which began in the Triassic, all other types of plants began to develop in the Late Paleozoic, but they did not occupy an important position. The dry climate of the Permian continued into the Early and Middle Triassic, and it was not until the late Middle Triassic that plants began to flourish.

In the Late Triassic, gymnosperms really became the main rulers of continental plants.

The typical red sandstone that marks the Triassic period indicates that the climate was relatively warm and dry, without any signs of glaciation. Today it is generally believed that there was no land or ice cover at the poles. Because there was only one continent on Earth at that time, the coastline at that time was much shorter than it is today, and there were relatively few offshore deposits left over from the Triassic period, which was only abundant in Western Europe.

Therefore, the stratification of the Triassic is mainly based on the fossils of organisms in the reef zone.

Permian, Triassic.

The Permian and Triassic here are all divided into rock strata.

2nd and 3rd floors. If there is only one layer, there is no "stack". Who to "stack" with.

So there is no one Assic, and other names are used.

The Triassic is a geological epoch between 100 million BC and 200 million BC, which is located between the Permian and Jurassic periods, and is the first epoch of the Mesozoic Era.

The Triassic is a geological epoch between 100 million BC and 200 million BC, which is located between the Permian and Jurassic periods, and is the first epoch of the Mesozoic Era.

The structure is: three (single structure) stacked (upper, middle and lower structure) and epoch (left and right structure). The pinyin is:

sāndiéjì。

What is the specific interpretation of the Triassic, we will introduce it to you through the following aspects:

Idioms about the Triassic.

When the family established the Ji Dun Gang, Zhen Ji was heavy, three stacks and four Luo wisps of Ji existed, and I didn't know that Ji Ji Ji Ji Ji

Words about the Triassic.

Dun Gang, Zhen Ji, broken melon, heavy three-fold, four-fold, three-fold, Yang, Guan, Gang, discipline, abolished, slack, law, disorder, discipline, and group friends, and established discipline, discipline, people, and discipline.

Sentence formation about Triassic.

1. Late Paleozoic or Triassic collisional orogenic belt in the Southern Tianshan Mountains?

2. In the Triassic, the South China and North China cratons collided, and the Tanlu fault zone was formed.

3. His mind raced to the TV documentary program about lizards in the animal world that he had watched recently, and Su Dian searched his intestines and stomachs to smash the belly or lead to try to find a trace of weakness in this cold-blooded animal that had existed since the Triassic period. The regiment does.

4. The pre-Permian period was the beginning of the fission movement; The second period is the peak period of ground fissure; The Triassic was a period of deterioration of ground fissures.

5. The volcanic activity of the Mesozoic Triassic and the Cretaceous of the Chain was active in the southeast and southwest of Guangxi.

The structure of the Triassic is: Triassic (monolithic structure) Assimic (upper, middle, and lower structure) (left and right structure).

The structure of the Triassic is: Triassic (monolithic structure) Assimic (upper, middle, and lower structure) (left and right structure). Pinyin is: sāndiéjì.

What is the specific interpretation of the Triassic, we will introduce it to you through the following aspects:

1. Explanation of terms [click here to view the details of the plan].

The Triassic (English: Triassic), a geological epoch between 100 million BC and 200 million BC, is located between the Permian and Jurassic periods, and is the first epoch of the Mesozoic Era.

Idioms about the Triassic are repentant.

Dungang, Zhenji, Luo Weiji, the Ji Cun, the master of the discipline, do not know the discipline, the extremely heavy, the three stacks, the four outlines, the era is relaxed.

Words about the Triassic.

Gang discipline is abolished, discipline is relaxed, discipline is discussed, discipline is the intersection of the group, the discipline of the Quartet, the discipline is not known, the discipline is extremely three-fold, Yangguan is broken, the melon is old, the family is in charge, the discipline is heavy, the three-fold and the four defeats, and the law is chaotic.

Sentence formation about Triassic.

1. At the junction of Daocheng County in western Sichuan and Shangri-La County in northeast Yunnan, there is a set of epigenetic porphyry bodies, which are formed in the Triassic.

2. In the Triassic, the orthogonal evolution of the basin bridge experienced a complete tectonic cyclic process formed by extensional depression basins, disturbed basins formed by tectonic extrusion, and extrusion and rolling uplift exposed to the sea surface.

3. The Mesozoic Triassic and Cretaceous volcanic activities were active in the southeast and southwest of Guangxi.

4. The Triassic is the oldest of the Mesozoic Era, followed by the Jurassic and Cretaceous.

5. His mind quickly turned to the TV documentary program about lizards in the animal world that he had watched recently, and Su Dian searched his intestines and racked his brains, trying to find a trace of weakness in this cold-blooded animal that had existed since the Triassic period.

Summary. Hello, Cretaceous Jurassic Triassic time order is Triassic, Jurassic, Cretaceous. The Jurassic is a geological epoch between the Triassic and Cretaceous periods.

The Jurassic is the second period of the Mesozoic Era, beginning with the extinction of the Triassic Jurassic. While the rock traces of this period are very clear and clear, the exact timing of its beginning and end, like other ancient geological epochs, cannot be determined very accurately.

Hello, the chain burns the Cretaceous Jurassic Triassic in chronological order of Triassic, Jurassic, Cretaceous. The Jurassic is a geological epoch between the Triassic and Cretaceous periods. The Jurassic is the second period of the Mesozoic Era, beginning with the extinction of the Triassic Jurassic.

Although the rock traces of this period are very obvious and clear, the exact timing of its beginning and end, like that of other ancient geological epochs, cannot be very accurately determined.

The Triassic (English: Triassic) is a geological time Liang closed era from 100 million BC to 200 million BC, it is located between the Permian and Jurassic, and the first era of the Mesozoic Era. The beginning and end of the Triassic were each marked by an extinction event.

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