About: Ordovician-Silurian extinction events   Sponge Permalink

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The extinctions occurred approximately 444–447 million years ago and mark the boundary between the Ordovician and the following Silurian Periods. During this extinction event, which may have been composed of several distinct closely spaced events, there were several marked changes in biologically responsive carbon and oxygen isotopes, which may indicate separate events or particular phases within one event.

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  • Ordovician-Silurian extinction events
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  • The extinctions occurred approximately 444–447 million years ago and mark the boundary between the Ordovician and the following Silurian Periods. During this extinction event, which may have been composed of several distinct closely spaced events, there were several marked changes in biologically responsive carbon and oxygen isotopes, which may indicate separate events or particular phases within one event.
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abstract
  • The extinctions occurred approximately 444–447 million years ago and mark the boundary between the Ordovician and the following Silurian Periods. During this extinction event, which may have been composed of several distinct closely spaced events, there were several marked changes in biologically responsive carbon and oxygen isotopes, which may indicate separate events or particular phases within one event. At that time all complex multicellular organisms lived in the sea, and around 100 marine families became extinct, covering about 49% of genera of fauna (a more reliable estimate than species). The brachiopods and bryozoans were decimated, along with many of the trilobite, conodont and graptolite families.
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