Mesozoic Era

The Mesozoic Era is a geological era that lasted from about 252 to 66 million years ago. It is often referred to as the "Age of Reptiles" due to the dominance of dinosaurs during this time period. The Mesozoic Era is divided into three periods: the Triassic, Jurassic, and Cretaceous.

Triassic Period (252-201 million years ago)

The Triassic period marked the beginning of the Mesozoic Era. During this time, the first dinosaurs and mammals appeared. The supercontinent Pangaea started to break apart, leading to the formation of separate landmasses.

Jurassic Period (201-145 million years ago)

The Jurassic period is known for the dominance of dinosaurs, including the massive herbivorous sauropods and the fierce carnivorous theropods. This period also saw the rise of early birds and the first flowering plants.

Cretaceous Period (145-66 million years ago)

The Cretaceous period witnessed the diversification of dinosaurs and the emergence of new groups such as the duck-billed hadrosaurs and the horned ceratopsians. It also saw the evolution of flying reptiles known as pterosaurs and the appearance of the first modern mammals.

Study Guide for Mesozoic Era

1. What is the Mesozoic Era?
2. Identify the three periods of the Mesozoic Era.
3. Describe the major events and developments in each period of the Mesozoic Era.
4. Explain the significance of the Mesozoic Era in the evolution of life on Earth.
5. Compare and contrast the Mesozoic Era with other geological eras.

[Mesozoic] Related Worksheets and Study Guides:

• Geologic timeScience • Eighth Grade