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Dinosaurs -- Chronology.

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View Resource New research indicates that asteroids barraged the Earth's surface for an additional two billion years

Ancient asteroids kept on coming http://www.nature.com/news/ancient-asteroids-kept-on-coming-1.10504 Dinosaurs were declining before asteroid struck, say scientists http://www.csmonitor.com/Science/2012/0501/Dinosaurs-were-declining-before-asteroid-struck-say-scientists-video Triceratops was already on road to extinction before asteroid wiped out...

https://scout.wisc.edu/report/2012/0504