TIME LINE PALEOZOIC ERA

PALEOZOIC OR PRIMARY

From 590 to 248 million years ago.Flowering of fish and amphibians. Appearance of the first reptiles. Development of terrestrial green plants.

Marine invertebrates: burrowing worms and trilobitesFirst agnate (jawless fish)

Cambrian

1. 590 myr

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• The Cambrian period is considered one of the most important periods with respect to the theory of evolution, because in it we can appreciate how organisms could go from having a simple structure to a complex and unique one. In this period of time, almost all the groups of animals that we know today came into existence, with the exception of vertebrate animals. It should be noted that all forms of life on earth in this period were still in the seas. When we talk about the Geology of this period, it is said that the Cambrian continents are given thanks to the fragmentation of the supercontinent Pannotia. This resulted in the formation of the supercontinent that we will know as Gondwana and three other smaller continents such as Laurentia, Siberia and Baltic. With the passage of time, Gondwana will go from being located in equatorial areas to much colder distances.

Apogee of the agnate

Ordovician

2. 505 myr

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The Ordovician is the second of the six periods into which the Paleozoic era is divided. It begins at the end of the Cambrian (488.3 ± 1.7 million years ago) and ends at the beginning of the Silurian (443.7 ± 1.5 million years ago). It takes its name from the Welsh tribe of the Ordovicians and was defined by Charles Lapworth in 1879, ending a dispute that pitted the theories of Adam Sedgwick and those of Roderick Murchison, who assigned the same rock types in North Wales to the Cambrian or Silurian, respectively. Lapworth concluded that the type of fossil fauna present in these strata was different from that which appeared during the Cambrian or Silurian periods and, therefore, should be considered as a new period.

First osteictians (fish with bones)Shell Beings: Corals and filter feeders

Silurian

3. 438 myr

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The Silurian period began about 440 million years ago, and ended about 415 million years ago. One of the aspects that stand out most during the period is the fact that almost all organisms become extinct. However, we will see how plants and different species of animals begin to conquer the earth's surface. Although many species disappear during this period, a few organisms manage to survive these changes and even adapt. This brought with it new species, such as the jawed fish.

Maximum diversification of fish in marine and continental waters: fish with skeleton and cartilage, fish with lobe fins and lung-breathing fish, which give rise to the first marine amphibians.Extinction of many marine amphibians and trilobites.First flightless insects

Devonian

4. 408 myr

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The Devonian period was one of the five subdivisions of the Paleozoic Era. It lasted about 56 million years, in which the planet underwent a large number of changes at the geological level, but especially in biodiversity. During this period, there was a wide development of some groups of animals, especially those that inhabited marine environments. There were also important changes in terrestrial habitats, appearing large plants and the first terrestrial animals.

Disappearance of agnate and appearance of the first amphibians

Carboniferous

5. 360-320 myr

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It is known as the Carboniferous Period or simply Carboniferous to the penultimate step of the Paleozoic Era (started approximately 542 million years ago and ended about 298 million years ago) in the geological time scale. In other words, it is the fifth period of the Paleozoic Era, preceded by the Devonian and succeeded by the Permian. The Carboniferous begins about 359 million years ago and ends approximately 299 million years ago. It is the longest period of the Paleozoic Era and one of the most tectonically active in Earth's geological history.

Peak of amphibians and appearance of the first reptiles

Permian

6. 290 myr

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On the geologic timescale, the Permian Period is the last period of the Paleozoic Era (beginning about 542 million years ago and ending about 251 million years ago), post-Carboniferous and prelude to the Mesozoic Era. The Permian began about 299 million years ago and culminated 251 million years ago with the Permian-Triassic Mass Extinction, the largest mass extinction event in the history of our planet. Thus ends the Paleozoic Era.

• Elemento genial A
• Elemento genial B
• Elemento genial C
• Elemento genial D
• Elemento genial E