The Harvard Gazette: Fish teeth mark periods of evolution

The Harvard Gazette: Fish teeth mark periods of evolution. “Elizabeth Sibert is rewriting the story of how the asteroid impact that killed off the dinosaurs affected fish, and she’s doing it one tooth at a time. Based on close examination of thousands of fossilized fish teeth, Sibert, a Junior Fellow of the Harvard Society of Fellows, found that while the impact did cause some fish species to die off, it also set the stage for two periods of rapid evolution among marine life….Going forward, Sibert said she hopes to continue to build a database of fossil teeth and is working with collections at Harvard’s Museum of Comparative Zoology (MCZ) to connect the ancient teeth with modern fish.”