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PALEOZOIC ERA: began 541 million years ago and ended about 252 million years ago. It covers the appearance of animals with shells or exoskeletons.
The Paleozoic era is divided into 6 periods. -
The Cambrian Period saw the most intense outburst of life ever known, this led to many new species of animals.
Complex multicellular organisms also began to appear. -
The biggest explosion of life. -
The ORDOVICIAN PERIOD is characterized by the rise in sea level, this caused a lot of life and new ecosystems in the sea.
The Ordovician period was created to resolve a conflict between two geologists who disagreed with the length of years of the Cambrian and Silurian periods.
in addition there was an ice age that lasted approximately 1.5 million years. -
Increased life in marine ecosystems. -
The main characteristic of this period is the warming of the Earth after the glaciation of the Ordovician Period and the recovery of life after the mass extinction (animals, plants ...).
there was a long warm greenhouse phase. -
The warming of the earth after the glaciation of the Ordovician period. -
The first amphibians emerged At the end of the period there was a mass extinction that seriously affected marine life. oil and gas deposits formed in some areas.
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The appearance of the first amphibians. -
A lot of mineral coal was produced in the world, amphibians dominated the world and gave rise to the first reptiles and there was a lot of volcanic activity.
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Amphibian development begins giving rise to reptiles. -
In this last stage of the Paleozoic, the first mammals and turtles appeared.
The climate of that period caused a drought and aridity, causing the glaciers to recede and creating many swamps. -
I hit a meteorite that killed 96% of marine life -
The MESOZOIC ERA: It began 250 million years ago and ended 66 million years ago, it is known as the era of the dinosaurs, since in that period these gigantic reptiles dominated the earth.
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The climate was quite hot and dry and deserts and evaporites were created at the end of this period, dinosaurs began to appear.
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The appearance of the dinosaurs. -
The climate was quite hot and dry and deserts and evaporites were created at the end of this period, dinosaurs began to appear.
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The largest dinosaurs appeared. -
It is the last period of the Mesozoic era, the dinosaurs ruled the earth throughout this period, but it was also where they were extinguished by the asteroid and 75% of the planet lost its life.
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This was the period where dinosaurs reigned. -
CENOZOIC ERA: This era began with the extinction of the dinosaurs approximately 66 million years ago, it is known as the Age of mammals, because the development of mammals began, and in this era the human being made its appearance.
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the primates and the ancestors of today's carnivores appeared and the development of modern plant species and became the most diverse fauna on earth.
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The super continent Pangea separates and the continents are formed. -
Mammals and birds develop quite a bit, the climate cooled down, causing the Quaternary glaciations, and the Hominids appeared in the Quaternary.
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Great development in mammals and birds.