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Dinosaurs
The Cretaceous Period



The Cretaceous Period

A Short Reader

Reading Level
     edHelper's suggested reading level:   grades 8 to 12
     Flesch-Kincaid grade level:   8.13

Vocabulary
     challenging words:    tyrannosaurus, facial, opening, evergreen, fossil, mass, record, lasted, extinction, existence, shallow, modern, apart, neck, island, itself
     content words:    North America, Atlantic Ocean, North American Inland Sea


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The Cretaceous Period
By Cindy Grigg
  

1     The last of the dinosaurs lived during a time called the Cretaceous period. This time period lasted from about 135 million to 65.5 million years ago. Some sources give the years of 146, 145, or 144 million to 65 million years ago.
 
2     In the Cretaceous period, the middle of North America was covered by a shallow sea. The Atlantic Ocean began opening up between Europe and North America as those continents rifted. Other continents that had begun pulling away from each other in the Jurassic continued drifting apart. India was an island by itself.
 
3     Evergreen trees, mosses, and ferns had been the main types of plants, but now in the Cretaceous, flowering plants appeared. Bees did, too. Hardwood trees like oaks and maples first appeared in the fossil record.

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