The Cambrian Biography PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download The Cambrian Biography PDF full book. Access full book title The Cambrian Biography by William Owen Pughe. Download full books in PDF and EPUB format.
Author: William Owen Pughe
Publisher:
ISBN:
Category : Celts
Languages : en
Pages : 370
Get Book Here
Book Description
Author: William Owen Pughe
Publisher:
ISBN:
Category : Celts
Languages : en
Pages : 370
Get Book Here
Book Description
Author: Charles River
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
Get Book Here
Book Description
*Includes pictures *Includes a bibliography for further reading 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.
Author: John Foster
Publisher: Indiana University Press
ISBN: 0253011884
Category : Science
Languages : en
Pages : 457
Get Book Here
Book Description
This volume, aimed at the general reader, presents life and times of the amazing animals that inhabited Earth more than 500 million years ago. The Cambrian Period was a critical time in Earth's history. During this immense span of time nearly every modern group of animals appeared. Although life had been around for more than 2 million millennia, Cambrian rocks preserve the record of the first appearance of complex animals with eyes, protective skeletons, antennae, and complex ecologies. Grazing, predation, and multi-tiered ecosystems with animals living in, on, or above the sea floor became common. The cascade of interaction led to an ever-increasing diversification of animal body types. By the end of the period, the ancestors of sponges, corals, jellyfish, worms, mollusks, brachiopods, arthropods, echinoderms, and vertebrates were all in place. The evidence of this Cambrian "explosion" is preserved in rocks all over the world, including North America, where the seemingly strange animals of the period are preserved in exquisite detail in deposits such as the Burgess Shale in British Columbia. Cambrian Ocean World tells the story of what is, for us, the most important period in our planet's long history.
Author: D Erwin
Publisher: Bedford
ISBN: 9781936221035
Category : Education
Languages : en
Pages : 0
Get Book Here
Book Description
The Cambrian Period records one of the most extraordinary transitions in the history of life. Although animals may have first appeared nearly 700 million years ago, with the earliest sponges, their initial diversifications appear to have been modest until a richly diverse fossil fauna appeared abruptly about 170 million years later. In The Cambrian Explosion, Erwin and Valentine synthesize research from many fields to explain why there was such remarkable novelty of animal forms.
Author: Xian-guag Hou
Publisher: Wiley-Blackwell
ISBN: 9781405106733
Category : Science
Languages : en
Pages : 248
Get Book Here
Book Description
The Chengjiang biota is one of the most remarkable fossil discoveries ever made. The Cambrian Fossils of Chengjiang is the first book in English to provide fossil enthusiasts with an overview of the fauna. 100 superb full color plates. First English language illustrated guide to this important fauna. A must-have for all palaeontologists worldwide. To see a collection of images from the book, click on the following link: http://www.blackwellpublishing.com/chengjiang
Author: Stephen Jay Gould
Publisher: W. W. Norton & Company
ISBN: 0393245209
Category : Science
Languages : en
Pages : 350
Get Book Here
Book Description
"[An] extraordinary book. . . . Mr. Gould is an exceptional combination of scientist and science writer. . . . He is thus exceptionally well placed to tell these stories, and he tells them with fervor and intelligence."—James Gleick, New York Times Book Review High in the Canadian Rockies is a small limestone quarry formed 530 million years ago called the Burgess Shale. It hold the remains of an ancient sea where dozens of strange creatures lived—a forgotten corner of evolution preserved in awesome detail. In this book Stephen Jay Gould explores what the Burgess Shale tells us about evolution and the nature of history.
Author: Karen Fox
Publisher: ANU Press
ISBN: 1760462756
Category : Biography & Autobiography
Languages : en
Pages : 239
Get Book Here
Book Description
Dictionaries of national biography are a long-established and significant genre of biographical and historical writing, existing in many forms across the globe. This book brings together practitioners from around the English‑speaking world to reflect on national biographical dictionary projects’ recent cultural journeys, and the challenges presented to them by such developments as the transition to a digital environment, a new alertness to the need to represent diversity, and the rise of transnationalism. Exploring their paths forward, the chapters of this book collectively make a powerful argument for the continued value and importance of large‑scale collaborative biographical dictionary research.
Author: Charles Penrhyn Gasquoine
Publisher:
ISBN:
Category : Cambrian Railways
Languages : en
Pages : 240
Get Book Here
Book Description
Author: Tom McCann
Publisher: Geological Society of London
ISBN: 9781862392458
Category : Science
Languages : en
Pages : 804
Get Book Here
Book Description
Publishers Weekly Top 10 Best of the Year In her new collection, Story Prize finalist Maureen F. McHugh delves into the dark heart of contemporary life and life five minutes from now and how easy it is to mix up one with the other. Her stories are post-bird flu, in the middle of medical trials, wondering if our computers are smarter than us, wondering when our jobs are going to be outsourced overseas, wondering if we are who we say we are, and not sure what we'd do to survive the coming zombie plague. Praise for Maureen F. McHugh: "Gorgeously crafted stories."—Nancy Pearl, NPR "Hauntingly beautiful."—Booklist "Unpredictable and poetic work."—The Plain Dealer Maureen F. McHugh has lived in New York; Shijiazhuang, China; Ohio; Austin, Texas; and now lives in Los Angeles, California. She is the author of a Story Prize finalist collection, Mothers & Other Monsters, and four novels, including Tiptree Award-winner China Mountain Zhang and New York Times editor's choice Nekropolis. McHugh has also worked on alternate reality games for Halo 2, The Watchmen, and Nine Inch Nails, among others. io9 Best SF&F Books of 2011 Tiptree Award Honor List Philip K. Dick Award finalist Story Prize Notable Book
Author: Robert Williams
Publisher: Good Press
ISBN:
Category : Biography & Autobiography
Languages : en
Pages : 79
Get Book Here
Book Description
In 'Biographies of the Most Eminent Individuals from the Principality of Wales' by Robert Williams, readers are taken on a captivating journey through the lives of some of the most notable figures from Wales. Written in a detailed and descriptive style, the book provides a vivid portrayal of historical and cultural context, offering insights into the lives and achievements of these extraordinary individuals. Williams' literary craftsmanship shines through in his ability to bring these biographies to life, making for a compelling and informative read within the field of Welsh literature. This book serves as a valuable resource for those interested in the history and culture of Wales, showcasing the impact of these eminent figures on shaping the region. Robert Williams' dedication to preserving and sharing the stories of these individuals is evident throughout the book, highlighting his passion for Welsh history and literature. I highly recommend 'Biographies of the Most Eminent Individuals from the Principality of Wales' to readers seeking a deeper understanding of Wales' influential personalities and their contributions to society.
