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In Earth’s Greatest Extinction, Land Animals Began Dying Off Long
When Trilobites Ruled the World - The New York Times
extinction | Definition & Examples | Britannica.com
Trilobite Geological Time Scale
Trilobites - British Geological Survey
When Trilobites Ruled the World - The New York Times
Trilobite Facts: Amazing Animals That Existed Before The Dinosaurs
When Did Trilobites Become Extinct? (Are They Alive Today?) - Rock Seeker