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In the early and late Cretaceous periods, changing geological and ecological conditions created opportunities for the expansion of dinosaurs, including several families that first appeared at this time. However, these same ecological changes also contributed to the eventual extinction of dinosaurs large and small. Includes full-color photographs and illustrations, sidebars, references, research ... More

In the early and late Cretaceous periods, changing geological and ecological conditions created opportunities for the expansion of dinosaurs, including several families that first appeared at this time. However, these same ecological changes also contributed to the eventual extinction of dinosaurs large and small. Includes full-color photographs and illustrations, sidebars, references, research sources, glossary, appendixes, author profile and index.

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