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The Paleozoic Era began 541 million years ago and ended about 252 million years ago. In other words, its duration was approximately 290 million years. It ranges from the appearance of animals with shells or exoskeletons, to the emergence of the first amphibians and reptiles.
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The Cambrian explosion is known as the event that occurred during the Cambrian period in which most of the current animal phyla appeared. That is, when we talk about the Cambrian explosion, we are talking about the origin of the animals that inhabit the Earth today. This process occurred over millions of years, and allowed much more complex forms to evolve from very simple organisms. -
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In this period, a day had 21 hours and there were no animals on land due to the lack of oxygen in the atmosphere. Fossils abound, among which trilobites stand out, and oil and gas deposits were formed in some regions. -
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In the Silurian the first plants appeared -
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The first amphibians emerge. At the end of the period there was the Devonian mass extinction, severely affecting marine life. During the Devonian, oil and gas deposits were formed in some areas. -
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In the early Carboniferous, the global drop in sea level that occurred at the end of the Devonian was reversed, and it rose, creating widespread epicontinental seas. There was also a decrease in polar temperatures in the south, in fact southern Gondwana was glacial throughout the period. -
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In the permian there was a mass extinction of up to 96% of the animals, this due to the intense volcanic activity in the basalt volcanic formations of Siberia and the emission of methane from the bottom of the sea -
The Mesozoic Era is known as the Secondary Era or the age of the dinosaurs. It lasted 186 million years, beginning 250 million years ago and ending 66 million years ago. It is known as the age of the dinosaurs because it was during this period that these gigantic animals populated the earth
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life slowly recovered in the first half and dinosaurs dominated the world in the second half. The Triassic period saw the evolution of the first true mammals and the first flying vertebrates called pterosaurs. -
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This period is characterized by the hegemony of the great dinosaurs and by the split of Pangea into the Laurasia and Gondwana continents. From the latter Australia was split off (in the Upper Jurassic and early Cretaceous), just as Laurasia split into North America and Eurasia. -
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the great mass extinction event occurred that wiped out not only most of the dinosaurs on Earth, but also 75% of life on the planet. -
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The Cenozoic era began about 65 million years ago and is known as the Age of Mammals, as it is the dominant group of vertebrates in terrestrial ecosystems, which replaced the dinosaurs of the Mesozoic. This stage is known for the geographical displacements that occurred over the years.
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The old tertiary period included Paleogene and Neogene. End of recent ice age and rise of human civilization. Flowering and subsequent extinction of many large mammals (Pleistocene megafauna). Homo habilis appears and anatomically modern humans develop. -
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It was during the Quaternary when Homo sapiens appeared on Earth. ... In turn, large species, both plant and animal, became extinct, and birds and mammals were the vertebrates that dominated the Earth.