Earth Sciences 1083F/G Lecture Notes - Lecture 24: Sulfur Dioxide, Siberian Traps, Deccan Traps

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The greatest information is known about this period of mass extinction. Sudden winter lead to depletion of ozone which led to acid rain. Mass extinctions of the phanerozoic: the big five. Mass extinctions are as important as the evolutionary process. Mass extinction are different from regular extinction as it involves different species of organisms going extinct at the same time and then new species come in to take their place. These five periods coincide with the geologic times scale. This time scale was built on the basis of rock types and the changes of the fossils in the rocks that have been found. K refers to cretaceous as there are already two other c periods in the time scale. Due to the decrease in shallow seas between the landmass, animals began to lose their habitat: the diversity of habitats was decreasing. Land areas separated (despite fairly close proximity of continents to one another) -lots of.

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