Jump to ContentJump to Main Navigation
Animal EvolutionGenomes, Fossils, and Trees$
Users without a subscription are not able to see the full content.

Maximilian J. Telford and D.T.J. Littlewood

Print publication date: 2009

Print ISBN-13: 9780199549429

Published to Oxford Scholarship Online: September 2009

DOI: 10.1093/acprof:oso/9780199549429.001.0001

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 17 January 2021

The earliest fossil record of the animals and its significance

The earliest fossil record of the animals and its significance

(p.3) CHAPTER 1 The earliest fossil record of the animals and its significance
Animal Evolution

Graham E. Budd

Oxford University Press

The fossil record of the earliest animals has been enlivened in recent years by a series of spectacular discoveries, including embryos, from the Ediacaran to the Cambrian, but many issues, not least of dating and interpretation, remain controversial. In particular, aspects of taphonomy of the earliest fossils require careful consideration before pronouncements about their affinities. Nevertheless, a reasonable case can be now made for the extension of the fossil record of at least basal animals (sponges and perhaps cnidarians) to a period of time significantly before the beginning of the Cambrian. The Cambrian explosion itself still seems to represent the arrival of the bilaterians, and many new fossils in recent years have added significant data on the origin of the three major bilaterian clades. Why animals appear so late in the fossil record is still unclear, but the recent trend to embrace rising oxygen levels as being the proximate cause remains unproven and may even involve a degree of circularity.

Keywords:   Cambrian, Ediacaran, Snowball Earth, Metazoa, molecular clocks, oxygen

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .