Comments on: Sixth Mass Extinction Threatened by Ongoing Land Destruction https://www.frackcheckwv.net/2018/06/11/sixth-mass-extinction-threatened-by-ongoing-land-destruction/ Just another WordPress site Wed, 14 Feb 2024 02:06:39 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Chris Lécuyer https://www.frackcheckwv.net/2018/06/11/sixth-mass-extinction-threatened-by-ongoing-land-destruction/#comment-219021 Chris Lécuyer Thu, 28 Jun 2018 21:56:47 +0000 http://www.frackcheckwv.net/?p=24002#comment-219021 <strong>Learning from past climatic changes</strong> Christophe Lécuyer, CNRS UMR 5276, Laboratoire de Géologie de Lyon, Villeurbanne, France. Science 29 Jun 2018: Vol. 360, Issue 6396, pp. 1400-1401 DOI: 10.1126/science.aau1690 <strong>Summary</strong> Over the course of the past 540 million years, five catastrophic mass extinction events occurred as a result of global climate changes. Those periods of large-magnitude warming or cooling resulted from catastrophic events such as asteroid impacts, paroxysmal volcanic activity, or peculiar geographic distributions of continents (1). The last of these mass extinction events occurred 66 million years ago at the Cretaceous/Paleogene (K/Pg) boundary, which is well known for the vanishing of ammonoids and nonavian dinosaurs (see the figure). On page 1467 of this issue, MacLeod et al. (2) provide evidence that the temperature of surface marine waters off the coast of Tunisia rose by 5°C in the 100,000 years after the K/Pg boundary. Learning from past climatic changes

Christophe Lécuyer, CNRS UMR 5276, Laboratoire de Géologie de Lyon, Villeurbanne, France.

Science 29 Jun 2018: Vol. 360, Issue 6396, pp. 1400-1401
DOI: 10.1126/science.aau1690

Summary
Over the course of the past 540 million years, five catastrophic mass extinction events occurred as a result of global climate changes. Those periods of large-magnitude warming or cooling resulted from catastrophic events such as asteroid impacts, paroxysmal volcanic activity, or peculiar geographic distributions of continents (1).

The last of these mass extinction events occurred 66 million years ago at the Cretaceous/Paleogene (K/Pg) boundary, which is well known for the vanishing of ammonoids and nonavian dinosaurs (see the figure). On page 1467 of this issue, MacLeod et al. (2) provide evidence that the temperature of surface marine waters off the coast of Tunisia rose by 5°C in the 100,000 years after the K/Pg boundary.

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