• Science: Earth Sciences: Paleontology: By Geological Interval: Mesozoic  (7)
• Science: Earth Sciences: Paleontology: By Geological Interval: Paleozoic: Permian  (5)
• Science: Earth Sciences: Paleontology: Invertebrates: Arthropods: Trilobites  (15)

• The Permian Mass Extinction - Discusses the geologic setting, possible causes, and taxa affected by the extinction event at the end of the Paleozoic.
• Permian-Triassic Extinction - Short video showing rock layers being laid down during the Permian and Triassic periods, and background information on the mass extinctions that occurred at this time.
• The Permian-Triassic Extinction - Article by Andrew Alden proposing that new evidence and old, both support a volcanic explanation for this mass extinction when nine tenths of all species disappeared.
• The Permo-Triassic Extinction - Information on the biggest extinction known to man with a paleontological overview, evidence for the extinction, the groups concerned and the possible causes of the devastation.

• Big Crater Seen beneath Ice Sheet - The BBC provides news that what appears to be a 480km-wide crater has been detected under the East Antarctic Ice Sheet and may have been responsible for the extinction at the boundary of the Permian and Triassic. (June 3, 2006)
• Great Extinction Came in Phases - BBC News describes how Chinese rock evidence suggests that the biggest of the Earth's mass extinctions did not happen in one cataclysmic event. (April 1, 2005)

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