Devonian Period

The Devonian period is a major division of the geological timescale and is part of the Paleozoic era. It spans from 419.2 million years ago to 358.9 million years ago. The Devonian period is known for significant diversification and evolution of early plants, fish, and other life forms. It is often referred to as the "Age of Fishes" due to the remarkable development of fish during this period.

Key Events and Characteristics

1. Plant Evolution: The Devonian period saw the emergence of the first forests and significant diversification of plant life. Primitive plants such as ferns, lycophytes, and progymnosperms became widespread.
2. Marine Life: This period witnessed the rise of jawed fishes, including the first appearance of sharks. Fish diversity and size increased, with some species reaching substantial dimensions.
3. Terrestrial Fauna: The Devonian saw the evolution of early tetrapods, which were the first vertebrates to colonize land. These included amphibian-like creatures that represent the transition from aquatic to terrestrial life.
4. Mass Extinction: Towards the end of the Devonian, a significant mass extinction event occurred, leading to the disappearance of many marine organisms, including trilobites and reef-building organisms.

Study Guide

When studying the Devonian period, it's important to focus on the following key aspects:

• Understand the significance of plant evolution during the Devonian and its impact on terrestrial ecosystems.
• Examine the diversification of marine life, particularly the emergence of jawed fishes and early sharks.
• Explore the transition of vertebrates from water to land and the evolution of early tetrapods.
• Analyze the causes and consequences of the mass extinction event that marked the end of the Devonian period.

Additionally, it's essential to familiarize yourself with the geological and paleontological evidence that supports our understanding of the Devonian period, including fossil records and stratigraphic data.

Remember to make use of visual aids such as diagrams, timelines, and fossil images to reinforce your understanding of the Devonian period. This can help in visualizing the evolutionary changes that took place during this pivotal era in Earth's history.

Good luck with your studies!

[Devonian] Related Worksheets and Study Guides:

• Geologic timeScience • Eighth Grade