Citations:
“Devonian: The Devonian Extinction.” Devonian
“End-Triassic Extinction.” Encyclopedia Britannica Online.
Holland. 2015. “Ordovician-Silurian Extinction.” Encyclopaedia Britannica.
Knoll, Andrew H., Lehrmann, Daniel J., Payne, Jonathan L., Orchard, Michael J., Schrag, Daniel P., Wei, Jiayong. 2004. Large Perturbations of the Carbon Cycle During Recovery from the Late End-Permian Extinction. Science Vol. 305 no. 5683: 10.112
“Mass Extinction, Mass Die-Off Information, Prehistoric Facts– National Geographic.” National Geographic. National Geographic Society
“The Five Worst Mass Extinctions.” Endangered Species International. Endangered Species International Inc.
