Cretaceous Period

The Cretaceous Period is a geological period that occurred approximately 145 to 66 million years ago. It is the last period of the Mesozoic Era and is known for the dominance of dinosaurs and the evolution of flowering plants.

Key Events and Characteristics of the Cretaceous Period

• Dinosaurs: The Cretaceous Period was the heyday of the dinosaurs. It was during this time that many iconic dinosaur species such as Tyrannosaurus rex, Triceratops, and Velociraptor roamed the Earth.
• Extinction Event: The Cretaceous-Paleogene extinction event occurred at the end of the Cretaceous Period, leading to the extinction of the non-avian dinosaurs and many other species.
• Flowering Plants: The Cretaceous Period saw a rapid diversification and spread of flowering plants, also known as angiosperms. This had a significant impact on the Earth's ecosystems.
• Geography: During the Cretaceous Period, the Earth's landmasses were still connected as the supercontinent Pangaea began to break apart, leading to the formation of separate continents.
• Climate: The climate during the Cretaceous Period was generally warm and tropical, and sea levels were high, leading to the development of extensive shallow seas.

Study Guide

To study the Cretaceous Period, consider the following topics and questions:

1. What were the major dinosaur species that lived during the Cretaceous Period? Describe their characteristics and habitats.
2. What were the major factors contributing to the Cretaceous-Paleogene extinction event? How did it impact the Earth's ecosystems?
3. How did the rapid diversification of flowering plants during the Cretaceous Period affect the environment and the evolution of other organisms?
4. Explain the process of continental drift and the breakup of Pangaea during the Cretaceous Period. What were the consequences of this geological change?
5. Investigate the climate and sea level changes during the Cretaceous Period. How did these environmental factors influence the evolution of life on Earth?

By exploring these topics, you will gain a comprehensive understanding of the Cretaceous Period and its significance in the history of the Earth's life and geology.

[Cretaceous] Related Worksheets and Study Guides:

• Geologic timeScience • Eighth Grade