About: Ordovician–Silurian extinction events   Sponge Permalink

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The extinction occurred 443.8 million years ago, during the Great Ordovician Biodiversification Event.[7] It marks the boundary between the Ordovician and following Silurian period. During this extinction event there were several marked changes in biologically responsive carbon and oxygen isotopes. This complexity may indicate several distinct closely spaced events, or particular phases within one event. Statistical analysis of marine losses at this time suggests that the decrease in diversity was mainly caused by a sharp increase in extinctions, rather than a decrease in speciation.

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  • Ordovician–Silurian extinction events
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  • The extinction occurred 443.8 million years ago, during the Great Ordovician Biodiversification Event.[7] It marks the boundary between the Ordovician and following Silurian period. During this extinction event there were several marked changes in biologically responsive carbon and oxygen isotopes. This complexity may indicate several distinct closely spaced events, or particular phases within one event. Statistical analysis of marine losses at this time suggests that the decrease in diversity was mainly caused by a sharp increase in extinctions, rather than a decrease in speciation.
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  • The extinction occurred 443.8 million years ago, during the Great Ordovician Biodiversification Event.[7] It marks the boundary between the Ordovician and following Silurian period. During this extinction event there were several marked changes in biologically responsive carbon and oxygen isotopes. This complexity may indicate several distinct closely spaced events, or particular phases within one event. At the time, most complex multicellular organisms lived in the sea, and around 100 marine families became extinct, covering about 49%[8] of faunal genera (a more reliable estimate than species). The brachiopods and bryozoans were decimated, along with many of the trilobite, conodont and graptolite families. Statistical analysis of marine losses at this time suggests that the decrease in diversity was mainly caused by a sharp increase in extinctions, rather than a decrease in speciation.
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