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The Cambrian Period: The History and Legacy of the Start of Complex Life on Earth
The early history of Earth covers such vast stretches of time that years, centuries, and even millennia become virtually meaningless. Instead, paleontologists and scientists who study geochronology divide time into periods and eras. The current view of science is that Earth is around 4.6 billion years old, and the first 4 billion years of its development are known as the Precambrian period. For the first billion years or so, there was no life in Earth. Then the first single-celled life-forms, early bacteria and algae, began to emerge. It’s unclear where they came from or even if they originated on this planet at all, but this gradual development continued until around four billion years ago when suddenly (in geological terms) more complex forms of life began to emerge.
Scientists call this time of an explosion of new forms of life the Paleozoic Era, and it stretched from around 541-250 million years ago (Mya). In the oceans and then on land, new creatures and plants began to appear in bewildering variety, and by the end of this period, life on Earth had diversified into a myriad of complex forms that filled virtually every habitat and niche available in the seas and on the planet’s only continent, Pangea.
Despite all of the scientific advances made in the past few centuries, including an enhanced understanding of Earth’s geological past, very little is known about the planet’s early history. It is generally accepted that the planet formed somewhere in the region of 4.5 billion years ago, and at some point, the first life appeared in the form of tiny, single-celled creatures, but scientists are unsure of what this life looked like. One of the problems for those seeking to trace the history of life on Earth is that modern scholars are almost entirely dependent on fossil records, but the earliest types of life left few fossils. The best fossils are formed from the bones and hard body parts of dead creatures, but the earliest types of life were so small that they had no bones or cartilage and thus left no fossils. Thus, even though the Precambrian Period (4,600–541 millions of years ago (Mya)) covers over 80% of the entire history of the planet, scientists have very little idea of what forms of life existed then.
Then, as Earth entered the Cambrian Period, there was a relatively sudden increase in life form diversity throughout the oceans. Completely new forms of life, more complex and more diverse than anything that had been seen before, began to spread. This acceleration in the evolution of new forms of life was so dramatic that this has come to be known as the “Cambrian explosion.”
Although new species in the Cambrian explosion developed almost entirely in the oceans, the land was not entirely devoid of life. Though there were no plants or animals, mats of cyanobacteria and other types of microbes covered large terrestrial areas. Scientists have discovered the tracks of a creature that were left in mud that existed 551 Mya, and those tracks were left by leg-like appendages. Was this a fish-like creature that temporarily invaded the land, or was it something completely different than anything that exists today? There is no general consensus, but the Cambrian Period left a rich fossil record that provides a clear idea of the development of life during this time. At the same time, new discoveries are continually being made, and the more scientists discover about this mysterious period, the more their understanding of ancient Earth changes.
The Cambrian Period: The History and Legacy of the Start of Complex Life on Earth looks at the development of the era, the extinction event that preceded it, and how life began to evolve during it. Along with pictures depicting important people, places, and events, you will learn about the Cambrian Period like never before.
Scientists call this time of an explosion of new forms of life the Paleozoic Era, and it stretched from around 541-250 million years ago (Mya). In the oceans and then on land, new creatures and plants began to appear in bewildering variety, and by the end of this period, life on Earth had diversified into a myriad of complex forms that filled virtually every habitat and niche available in the seas and on the planet’s only continent, Pangea.
Despite all of the scientific advances made in the past few centuries, including an enhanced understanding of Earth’s geological past, very little is known about the planet’s early history. It is generally accepted that the planet formed somewhere in the region of 4.5 billion years ago, and at some point, the first life appeared in the form of tiny, single-celled creatures, but scientists are unsure of what this life looked like. One of the problems for those seeking to trace the history of life on Earth is that modern scholars are almost entirely dependent on fossil records, but the earliest types of life left few fossils. The best fossils are formed from the bones and hard body parts of dead creatures, but the earliest types of life were so small that they had no bones or cartilage and thus left no fossils. Thus, even though the Precambrian Period (4,600–541 millions of years ago (Mya)) covers over 80% of the entire history of the planet, scientists have very little idea of what forms of life existed then.
Then, as Earth entered the Cambrian Period, there was a relatively sudden increase in life form diversity throughout the oceans. Completely new forms of life, more complex and more diverse than anything that had been seen before, began to spread. This acceleration in the evolution of new forms of life was so dramatic that this has come to be known as the “Cambrian explosion.”
Although new species in the Cambrian explosion developed almost entirely in the oceans, the land was not entirely devoid of life. Though there were no plants or animals, mats of cyanobacteria and other types of microbes covered large terrestrial areas. Scientists have discovered the tracks of a creature that were left in mud that existed 551 Mya, and those tracks were left by leg-like appendages. Was this a fish-like creature that temporarily invaded the land, or was it something completely different than anything that exists today? There is no general consensus, but the Cambrian Period left a rich fossil record that provides a clear idea of the development of life during this time. At the same time, new discoveries are continually being made, and the more scientists discover about this mysterious period, the more their understanding of ancient Earth changes.
The Cambrian Period: The History and Legacy of the Start of Complex Life on Earth looks at the development of the era, the extinction event that preceded it, and how life began to evolve during it. Along with pictures depicting important people, places, and events, you will learn about the Cambrian Period like never before.
75 pages, Kindle Edition
First published October 15, 2020
180 people are currently reading
153 people want to read
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Displaying 1 - 20 of 20 reviews
December 29, 2020
The Cambrian Period: The History and Legacy of the Start of Complex Life on Earth
by Charles River Editors
This prehistoric read is really fun of incredible information and terrifying scenes from the past! The Great Dying and more all presented in a easy to understand way. When life was most vulnerable, nature's fury was full go! Excellent job of explaining this time period in a brief but concise way!
by Charles River Editors
This prehistoric read is really fun of incredible information and terrifying scenes from the past! The Great Dying and more all presented in a easy to understand way. When life was most vulnerable, nature's fury was full go! Excellent job of explaining this time period in a brief but concise way!
November 17, 2024
scientifically good but PLEASE have a geoscientist read a geoscience audiobook bc this narrator was just making pronunciations up as he went along. sincerely, a geochemist who found the audio painful
May 30, 2024
Audibook narration was terrible
April 15, 2022
It spends about the first half of the book as an introduction going through the Precambrian. It is a very short history, but otherwise is descent. Given the option I would give it 3.5 out of 5 (7/10), but it was worth rounding up.
November 17, 2020
A good summary of the geology, climate, and evolution of life during the Cambrian Period for the casual reader interested in science.
October 20, 2020
Charles Rivers Editors takes on the herculean task of explaining the Cambrian Period. First, they explain how the earth got to that point in time. It is difficult to pinpoint the time because new discoveries constantly shift the timeframe. After explaining the geology and biology leading up to the Cambrian Period, the authors take on the 'Cambrian Explosion.'
Before the explosion, there were a series of events that killed off life around the earth. However, during the Cambrian Period, the weather, sun, water, and life forces encouraged the emergence of complex creatures all over the earth. At this point, these creatures had enough vertebrae and spines to leave fossils for future study. Prior to the Cambrian Period, the creatures did not have enough structure to leave behind fossils.
I appreciated that the authors wrote this book with the assumption that readers would know nearly nothing about the subject (a very intelligent assumption) and explained unfamiliar words in the text (instead of in a glossary). This increased my understanding dramatically. Because of the elemental way the authors explained things, I came away with much more understanding than I'd expected to learn.
Before the explosion, there were a series of events that killed off life around the earth. However, during the Cambrian Period, the weather, sun, water, and life forces encouraged the emergence of complex creatures all over the earth. At this point, these creatures had enough vertebrae and spines to leave fossils for future study. Prior to the Cambrian Period, the creatures did not have enough structure to leave behind fossils.
I appreciated that the authors wrote this book with the assumption that readers would know nearly nothing about the subject (a very intelligent assumption) and explained unfamiliar words in the text (instead of in a glossary). This increased my understanding dramatically. Because of the elemental way the authors explained things, I came away with much more understanding than I'd expected to learn.
August 5, 2024
Well Done Quick Overview
This is a very useful review of current thinking on the Cambrian Period! I found much of the information useful and well written. For any one interested in Earth’s history who loves geology and paleontology this is a short, inexpensive and worthwhile read.
This is a very useful review of current thinking on the Cambrian Period! I found much of the information useful and well written. For any one interested in Earth’s history who loves geology and paleontology this is a short, inexpensive and worthwhile read.
December 8, 2020
An interesting insight into earth's formation
Very interesting! A lot of information in a few pages, but presented in clear, easy to follow format. It generates a desire to read more about the beginnings of our planet.
Very interesting! A lot of information in a few pages, but presented in clear, easy to follow format. It generates a desire to read more about the beginnings of our planet.
January 23, 2021
The Cambrian period
Sintesi con molte informazioni utili probabilmente per studenti liceali o universitari. Si legge bene, anche se a volte è un po’ ripetitivo. Il racconto non è molto avvincente.
Sintesi con molte informazioni utili probabilmente per studenti liceali o universitari. Si legge bene, anche se a volte è un po’ ripetitivo. Il racconto non è molto avvincente.
June 16, 2021
Good short introduction to the Cambrian Period
A short overview of the Cambrian period. This is a good starting point for those with little to no knowledge of this subject. Recommendations for further reading are provided in the back of the book.
A short overview of the Cambrian period. This is a good starting point for those with little to no knowledge of this subject. Recommendations for further reading are provided in the back of the book.
July 9, 2022
Intriguing exploration of the past
Nice to read a more focused look at one of the earliest yet very important parts of the evolution of life. This is a good starting point for further exploration of the era.
Nice to read a more focused look at one of the earliest yet very important parts of the evolution of life. This is a good starting point for further exploration of the era.
April 24, 2023
I have an interest in paleontology but close to zero knowledge about it. This was an extremely easy read that I had a lot of fun with, and it served as an excellent intro for future, possibly more complex books.
November 18, 2021
Interesting, concise overview of the topic.
January 21, 2022
Good summary
For the layman this book (it is short) provide a succinct summary of life’s development during the Cambrian period. The level of detail was perfect for me.
For the layman this book (it is short) provide a succinct summary of life’s development during the Cambrian period. The level of detail was perfect for me.
December 29, 2022
Short but excellent introduction. Best for people with little to no knowledge of the Cambrian Explosion. A great starting point for the common layperson.
January 19, 2023
A very brief overview. Good if you want the general details but too short to be really interesting.
October 1, 2023
This was an educational read. It whets the reader’s intellectual appetite to learn prehistory.
March 4, 2024
Good book for an intro into the Cambrian Period
April 16, 2024
Very good for an introduction. I wish it had more depth.
June 19, 2025
A well-researched book that offers a good introduction to probably one of the most fascinating periods in the history of earth - and the history of organize life on Earth.
Displaying 1 - 20 of 20 reviews