Triassic (English: Triassic) is the geological age from 250 million BC to 200 million BC, which lies between Permian and Jurassic and is the first period of Mesozoic. The beginning and end of Triassic was marked by an extinction event.
Although the rock marks in this period are very obvious and clear, the exact time of its beginning and end can not be determined as accurately as other ancient geological ages. The error is plus or minus millions of years.
During the Triassic, most of the continents on the earth formed a huge continent: Pan-continent.
The name of Triassic was put forward by Friedrich von Alber in 1834. He called the white limestone, black shale and the red three-layer rock layer between them common in Central Europe Triassic. Today, Triassic is divided into more sub-layers.
The Triassic climate was hot and dry, forming the typical red sandstone that can be seen now. The four seasons are distinct and the rainy season is very strong. The poles are wet and mild.
The typical red sandstone symbolizing Triassic indicates that the climate at that time was warm and dry, and there were no signs of glaciers. It is generally believed that there was no land or ice at the poles.
Because there was only one continent on the earth at that time, the coastline at that time was much shorter than today, leaving less offshore deposits, only western Europe. Therefore, Triassic stratification mainly depends on the biological fossils in the reef zone.
Because the Triassic began with an extinction event, its creatures were very differentiated from the beginning. Six-release Corallinae appeared at this time, and the earliest angiosperms and the earliest flying vertebrates (pterosaurs) may also appear at this time. The earliest tortoise in the world, the protognathus, also appeared in the late Triassic. The first ichthyosaurs appeared.
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