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Cretaceous
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Cretaceous Period

The Cretaceous Period began 145 million years ago and ended 65 million years ago. It was a time of global “greenhouse” conditions. The climate was much warmer and sea level was far higher than in the modern world.

The Western Interior Seaway extended over North America, sometimes covering Manitoba. Huge marine reptiles and fish swam in these waters. Dinosaurs roamed on coastal lowlands in places such as Alberta, while mountains were rising in the Cordillera.

At the end of Cretaceous time, an asteroid or comet struck the Earth. Global environmental change was severe. Dinosaurs and many other forms of life disappeared in a mass extinction.

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