Maastrichtian Age

The Maastrichtian age was the last part of the Cretaceous period . It lasted from about 71 to 65 million years ago, at the very end of the Mesozoic Era . Many dinosuars existed during this age, but it ended with a major mass extinction (the K-T extinction ).
Found on http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
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