e/simple/End-Ordovician extinction event

Information
has gloss	eng: The End–Ordovician extinction event is the third-largest extinction event of the Phanerozoic era. The Ordovician period followed the Cambrian and was followed by the Silurian. There were no living things on the land except for bacteria and perhaps some single-celled algae. The biota was almost entirely marine.
lexicalization	eng: End-Ordovician extinction event
lexicalization	eng: End–Ordovician extinction event
instance of	c/simple/Extinction events