LOCATION : The Living Earth > The origins of life > Mass extinction

Mass extinction


Due to there being evolution of life death and life came together. If death is considered as a part of evolution especially in relation to mass extinction and the biological world, the overall aspects of evolution can be adjusted. This is an extremely important point. Due to one type of extinction all individuals reached death and due to sudden changes externally meant that habitats were lost and species which could not find food vanished in the midst of history.
mass extinction
volcano effusion
In 1982 David Raup and Jack Sepkoski researched the living organisms which had lived abundantly during the geological age and it was evident that during the unit of a million years usually 2-4 families would become extinct and this was due to the flow of time and living organisms which could not adapt to the environment. This resulted in a natural wedding out and is seen as background extinction. On the other side, is the sudden extinction of many families has so occurred, it can be said that mass extinction was caused by the collision of meteorites and volcano effusion and such. Such mass extinction occurred in a relatively short period of time and from the viewpoint of the rapid changes.
This can be differentiated and standardized by the same geological ages as the Paleozoic, Mesozoic and Cenozoic Eras. Not only this but also the minority of living organisms which remained could become abundant again in a new environment, hence the evolution modal was also stipulated.

It is thought by today scientists that during the geological age five great mass extinctions occurred as follows in order of size.
  • 1)
  • The mass extinction towards the end of the Permain period. (2 hundred million 50 million years ago) (P-T boundary): The evolution from the Paleozoice Era to the Mesozoic Era: The incident of 96% of sea life and 75% of land life becoming extinct.
  • 2)
  • The mass extinction towards the end of the Cretaceous period. (65 million years ago) (K-T boundary): The evolution from the Mezozoic Era to the Cenozoic Era.
  • 3)
  • The mass extinction towards the end of the Devonian period (3 hundred million 60 million years ago).
  • 4)
  • The mass extinction towards the end of the Ordovician period (4 hundred million 40 million years ago).
  • 5)
  • The mass extinction towards the end of the Triassic period (2 hundred million years ago).