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Chapter 5: Problem 2

What was the Permian extinction?

Short Answer

Expert verified
The Permian extinction was the largest mass extinction event, occurring about 251 million years ago, wiping out a significant portion of marine and terrestrial species.

Step by step solution

01

Introduction to the Permian Period

The Permian Period was the last period of the Paleozoic Era, occurring approximately 299 to 251 million years ago. It ended with the largest mass extinction recorded in Earth's history, known as the Permian extinction.
02

Defining Mass Extinction

A mass extinction is an event where there is a substantial and abrupt loss of biodiversity in a relatively short period of geological time. It results in a significant percentage of species going extinct.
03

Details of the Permian Extinction Event

The Permian extinction occurred around 251 million years ago and is sometimes referred to as the 'Great Dying.' It wiped out approximately 90% of marine species and 70% of terrestrial vertebrate species.
04

Causes of the Permian Extinction

Possible causes for the Permian extinction include massive volcanic eruptions, climate change, ocean anoxia (lack of oxygen), and potentially an asteroid impact. These factors likely combined to create a hostile environment for life.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Permian Period
The Permian Period is a crucial chapter in Earth's history, marking the end of the Paleozoic Era. Roughly spanning from 299 to 251 million years ago, this period set the stage for dramatic biological and geological changes on our planet. It was a time when continents were clustered together in a supercontinent called Pangaea.

This continental formation significantly influenced global climates and environments. During the Permian, terrestrial life was thriving with diverse amphibians and the ancestors of early reptiles.
  • The Earth during this time had vast deserts due to the central positioning of Pangaea that restricted oceanic moisture from reaching inland.
  • Marine life was abundant, with varied species of coral and brachiopods dominating the seas.
But, as the Permian Period drew to a close, it faced one of the most severe biodiversity losses known to science.
mass extinction
Mass extinction events are periods in Earth's history when vast numbers of species perish in a relatively short geological timeframe. Such events result in substantial and irreversible loss of biodiversity, fundamentally altering ecosystems.

These extinctions typically occur due to drastic environmental changes that overwhelm the adaptive capabilities of life forms.
  • They can be driven by factors such as volcanic eruptions, climate shifts, ocean anoxia, or even asteroid impacts.
  • In a mass extinction, one could expect to see the extinction of a large percentage of existing species, significantly affecting marine and terrestrial life.
The Permian extinction, also known as the 'Great Dying,' is a prime example, with approximately 90% of marine species and 70% of land species vanishing.
Paleozoic Era
The Paleozoic Era is a fascinating era in Earth's ancient history, beginning around 541 million years ago and lasting until about 252 million years ago. It covers six geological periods, starting with the Cambrian and ending with the Permian.

Throughout the Paleozoic, life exponentially diversified, and almost all major animal groups emerged.
  • The Cambrian Explosion, a pivotal event, occurred early in this era, leading to a rapid increase in the diversity of life forms.
  • This era saw the first development of life on land, with plants and insects making the terrestrial environment dynamic.
The Paleozoic ended dramatically with the Permian extinction, wiping out much of life on Earth, paving the way for the Mesozoic Era, where dinosaurs would later rule.

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