End Permian extinction

what were the 2 separate events

Mid-Captanian extinction and End Permian

what life forms went extinct in the end Permian extinction

• trilobites

• rugose and tabulate corals

causes of the end permian mass extinction

• temperature gradient decreased with increasing global warming

• ocean acidification

• pangea formation

• siberian traps volcanism

explain how decreased temperature gradients caused the end Permian extinction

• oceans became stagnant and anoxic

• low temperature gradient, reduced winds and therefore ocean circulation

• visible in rock record

explain how the formation of pangea caused the end permian extinction

• high continent and deep oceans → ocean circulation change and regression which eliminated epicontinental seas and life

• vast arid climates with evaporite basins and immense dune fields → drying

• drying worsened by melting hydrates releasing methane

• drying → carbon burial in coal swamps decreased → increased atmospheric CO2 and warming

explain how Siberian traps volcanism caused the end Permian extinction

• increased atmospheric CO2 → global warming

• gases damaged ozone layer → increased UV radiation

• eruption lasted approx. 2 million years