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The Late Devonian mass extinction was one of the five largest mass extinction events in the history of life, said Professor Johnny Waters, who is a co-leader of the five-year, U.N. International Geoscience Programme project that began in 2011.
Many species vanished in five cataclysmic mass extinctions and today, 99.9 percent of all species that have existed on Earth are extinct. T he Ordovician-Silurian extinction occurred about 439 million years ago due to a drop in sea levels as glaciers formed followed by rising sea levels as glaciers melted.During this extinction 25 percent of marine families and 60 percent of marine genera (the classification above species) were lost.T he Late Devonian extinction took place somewhere around 364 million years ago. To this day its cause is unknown.uring this extinction 25 percent of marine families and 60 percent of marine genera (the classification above species) were lost. T he Late Devonian extinction took place somewhere around 364 million years ago.