The fossil record shows that the Earth's surface was divided into three distinct climatic zones. The climate is no longer what it used to be under the primary era characterized by its uniformity.The Pangea fracture is due to intense volcanic activity. These two continents were subdivided in turn, so Laurasia gave birth to North America and Eurasia, while the division of Gondwana allowed the birth of South America, Africa, Australia and Antarctica. When the Triassic began, the Pangaea split into two blocks, Laurasia and Gondwana. In the beginning, the continents were not as we know them, the whole of the lands were one and the same block called the Pangaea.Some interesting facts about the Mesozoic (the period in which our companions lived): Which we won't quote here out of a desire to keep you awake ) These two series are divided into six floors each (12 stages in all). This broad period is divided into two stages called the Lower Cretaceous and the Upper Cretaceous. This meteorite would have generated large clouds of dust when it crashed against the earth, which would have veiled the atmosphere and caused the earth's temperatures to drop drastically until the dinosaurs were killed. What marks the end of this era as well as dinosaurs is the impact of an asteroid against the earth. The Cretaceous (between 145.0 and 66.0 AC): Its end corresponds to the disappearance of dinosaurs and amonites.The upper Jurassic is divided into three stages, the middle four stages and the lower four. Jurassic (between 201.3 and 145.0 AC): It is composed of three parts, the Lower, Middle and Upper Jurassic.Stratigraphic floors are the basic time unit of the geological time scale, its duration is a few million years. The lower, middle and upper Triassic, which are themselves subdivided into seven stratigraphic stages. The Triassic period is divided into three periods. It was at this time that dinosaurs developed. ![]() ![]() The Triassic period (between -252.17 and 201.3 AC) lasts about 50.9 million years.The Mesozoic lasts a little over 186.2 million years (AC) and is composed of three periods: This geological age ranges from -252.2 million years to -66.0 million years. Their domination lasted more than 170 million years and was extended over most of the Mesozoic (commonly known as the Secondary Era or reptile era).
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