Biomarker Records Associated with Mass Extinction Events

  • Jessica H. Whiteside
    Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton SO14 3ZH, United Kingdom;
  • Kliti Grice
    Department of Chemistry, Western Australia Organic and Isotope Geochemistry Centre, and The Institute for Geoscience Research, Curtin University, Perth, Western Australia 6845, Australia;

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<jats:p> The history of life on Earth is punctuated by a series of mass extinction episodes that vary widely in their magnitude, duration, and cause. Biomarkers are a powerful tool for the reconstruction of historical environmental conditions and can therefore provide insights into the cause and responses to ancient extinction events. In examining the five largest mass extinctions in the geological record, investigators have used biomarkers to elucidate key processes such as eutrophy, euxinia, ocean acidification, changes in hydrological balance, and changes in atmospheric CO<jats:sub>2</jats:sub>. By using these molecular fossils to understand how Earth and its ecosystems have responded to unusual environmental activity during these extinctions, models can be made to predict how Earth will respond to future changes in its climate. </jats:p>

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