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Periods of extinction on Earth - Coggle Diagram
Periods of extinction on Earth
Ordovician
Aproximately 440-450 million years ago.
All the complex organisms lived in the sea, for example: graptolites, trilobites and brachiopods. In the extinction all of them died.
In the extinction 85% of Earth's fauna disappeared probably because of global cooling and the lowering of sea levels.
Devonian
From 416 to 359 millions years ago
Known as the era of the fish a great variety of them were created, plants and forests expanded; plants with seeds appeared; oil and gas fields formed.
The extinction killed 70% of marine creatures. Some possible causes are: global cooling, reduction in the levels of carbon dioxide or an asteroid impact.
Permian
Approximately 299-251 million years ago.
In the extinction 90% of species died, but it affected more to marine species.
The Pangea formed. Fish, amphibians, reptiles, invertebrates, ferns and conifers were abundant.
Some possible causes of the extinction are: intense volcanism, poisoning of the seas and the atmosphere or collision of asteroids.
Triassic
From 251 to 199 million years ago.
Some possible explanations for the extinction are: gradual climate changes, an asteroid impact, volcanic eruptions, or global cooling. :
Dinosaurs were dominating, mammals appeared, the breakout of Pangea began
The mass extinction was severe in oceans and affected a few in terrestrial ecosystems. The dinosaurs that survived the extinction evolved in the Jurassic period.
Cretaceous
It lasted from 145 to 66 millions years ago
Dinosaurs dominated, therefore a few mammals existed and similar fish of nowadays borned
More than 50% of the world's petroleum reserves formed, many of the trees were originated.
The dinosaurs became extinct because of an impact of an asteroid
