Ordovisium-Siluur-uitwissing: Verskil tussen weergawes

In die tyd van die uitwissing was alle lewe tot die oseane en seë beperk.<ref name="ucr">{{cite web|url= http://math.ucr.edu/home/baez/extinction|title= extinction}}</ref> Meer as 60% van die [[ongewerwelde]]s in die see is uitgewis.<ref>{{cite web |url=http://www.nasa.gov/vision/universe/starsgalaxies/gammaray_extinction.html |title=NASA – Explosions in Space May Have Initiated Ancient Extinction on Earth |publisher=Nasa.gov |date=30 November 2007 |access-11date=2 Junie 2010 |language=en |archive-30url=https://web.archive.org/web/20200324123554/https://www.nasa.gov/vision/universe/starsgalaxies/gammaray_extinction.html |accessdatearchive-date=201024 Maart 2020 |url-06status=live|df=dmy-02all}}</ref><ref>{{cite web|url=http://arjournals.annualreviews.org/doi/abs/10.1146/annurev.earth.29.1.331?journalCode=earth |title=The Late Ordovician Mass Extinction – Annual Review of Earth and Planetary Sciences, 29(1):331 – Abstract |publisher=Arjournals.annualreviews.org |date=2003-11-28 |accessdate=2010-06-02}}</ref> Die direkte rede vir die uitwissing is waarskynlik die beweging van die superkontinent [[Gondwana]] na die suidelike poolstreek. Dit het gelei tot ’n verkoeling, ysvorming en daling in die seevlak. Laasgenoemde het lewe aan die kus ontwrig.<ref name="sole" /><ref name=hanover>{{cite web|url= http://hannover.park.org/Canada/Museum/extinction/ordcause.html|title= Causes of the Ordovician Extinction}}</ref> Bewyse vir die ysvorming is in neerslae in die [[Sahara|Sahara-woestyn]] gevind.