Oceanic anoxic events (OAEs) were episodes of widespread marine anoxia during which large amounts of organic carbon were buried on the ocean floor under oxygen-deficient bottom waters. OAE2, occurring at the Cenomanian/Turonian boundary (about 93.5 Myr ago), is the most widespread and best defined OAE of the mid-Cretaceous.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/cretaceous-oceanic-anoxic-event-2-triggered-massive-magmatic-episode
[2] http://admin.indiaenvironmentportal.org.in/category/author/teven-c-turgeon
[3] http://admin.indiaenvironmentportal.org.in/category/author/robert-creaser
[4] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oceans-and-seas
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-sequestration