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Dr. Niles Eldredge, curator of fossil invertebrates at the American Museum of Natural History, delivered the keynote address at the Paleontological Research Institution's second annual Summer Symposium, July 25, 2008, at Ithaca's Museum of the Earth.

Eldredge is an American paleontologist and evolutionary biologist, who, along with Stephen Jay Gould, proposed the theory of punctuated equilibrium in 1972. Eldredge has devoted his career to examining evolutionary theory through the fossil record, specializing in the evolution of trilobites--a group of extinct arthropods that lived between 535 and 245 million years ago.

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