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This paper compares and contrasts the Permian and Cretaceous-Tertiary mass extinctions.

This paper takes a look at the Permian and Cretaceous-Tertiary periods of life on Earth – pre-historic forms of life from sea creatures to land and air creatures. During both of these periods, mass extinction occurred and a comparison of these two extinctions is documented in this paper.
From the paper:

“From the perspective of daily human life, we often think of tragedy on the level of individual death and destruction, and the concept of mass extinction as being confined to a species or at worst, an ecosystem. However, over the course of the existence of the earth, the planet has weathered many greater catastrophes. Geologists must take a much longer-term perspective of catastrophe when studying extinction. This paper will compare and contrast the Permian and Cretaceous-Tertiary mass extinctions.”