Triassic Period

The Triassic Period is the first period of the Mesozoic Era, lasting from approximately 251 million to 201 million years ago. It is a significant period in Earth's history, marked by major geological, climatic, and evolutionary events.

Geological Events

• During the early Triassic, the supercontinent Pangaea began to form, bringing together the Earth's landmasses into a single large landmass.
• Volcanic activity was widespread during this period, leading to the formation of large igneous provinces and contributing to environmental changes.
• The Triassic saw the emergence of the first dinosaurs, as well as the diversification of marine reptiles and early mammals.

Climatic Changes

• During the early Triassic, the Earth experienced a major extinction event known as the Permian-Triassic extinction, which resulted in the loss of approximately 90% of marine species and 70% of terrestrial vertebrate species.
• Following this extinction event, the climate gradually recovered, becoming warmer and more arid during the mid to late Triassic.

Key Study Points

1. What major geological events occurred during the Triassic Period?
2. How did the climate change during the Triassic Period?
3. What were the significant biological developments during the Triassic Period?
4. What were the key consequences of the Permian-Triassic extinction event?

[Triassic] Related Worksheets and Study Guides:

• Geologic timeScience • Eighth Grade