katsummary

Late Ordovician:

Possible climate changes exhibited during the time of extinction: rapid appearance and disappearance of glaciers, global cooling, and sea level fall, as much as a 50-100m fall during the first wave of extinction;; fall in seawater temperature

Evidence: reduced amounts of tropical flora and fauna; growth of Gondwanan ice caps, ?18O drop indicating sea temperature fall, low; ?13C decline indicating less photosynthesis.

Affected: Marine organisms from reduced shallow areas, tropical organisms, reef losses, coral loses; trilobite, brachiopod, graptolites, cystoids, conodants extinctions

Late Devonian:

Possible climate changes exhibited during time of extinction: global cooling, small bolide impact's rapid climate change effects, low levels of oxygen.

Evidence: decline in tropical faunas and coral reefs; extinction of brachiopods and atrypoids; some Iridium spikes indicating possibly small bolide impacts.

Affected: tropical faunas, coral reefs, fishes, brachiopods

Late Permian:

Possible climate changes exhibited during time of extinction: Sea level fall, possibly global cooling, possibly glaciation, assemblage of Pangea, changes in the global oceans, volcanism.

Evidence: jury is still out on whether or not glaciation and extinction coincided well enough; effects on marine organisms; oxygen, carbon, and sulfur evidence pointing to ocean chemistry changes, estensive basaltic volcanism in Siberian Traps

Affected: marine organisms, tabulates, rugose corals, trilobites, zooplankton, suspension feeders, planktotrophic larvae

Late Triassic:

Possible climate changes exhibited during time of extinction: bolide impact, sea level rise, global warming

Evidence: Manicougan impact crater in Quebec that is about 100 km in diameter, although no iridium spikes; evidence of oxygen losses

Affected: marine and terrestrial organisms, zooplankton, and suspension feeders

Late Cretaceous:

Possible climate changes exhibited during time of extinction: sea level fall; possibly global cooling prior to bolide; bolide impact climate changes e.g. acid rain, global cooling, global warming, darkness, etc, volcanism

Evidence: bolide evidence of iridium, shocked quartz, crater, etc; jury is still out on volcanism (scientists use it as a counter argument to bolide impact-volcanoes also release iridium)

Affected: dinosaurs, marine organisms, especially plankton, terrestrial flora such as evergreens, and large vertebrate fauna.