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The earliest fossil record of the animals and its significance
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2008 (English)In: Philosophical Transactions of the Royal Society of London. Biological Sciences, ISSN 0962-8436, Vol. 363, no 1496, 1425-1434 p.Article, review/survey (Refereed) Published
Abstract [en]

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 now be 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.

Place, publisher, year, edition, pages
2008. Vol. 363, no 1496, 1425-1434 p.
Keyword [en]
Cambrian, Ediacaran, Snowball Earth, Metazoa, molecular clocks, oxygen
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
URN: urn:nbn:se:uu:diva-88292DOI: 10.1098/rstb.2007.2232ISI: 000253865600002PubMedID: 18192192OAI: oai:DiVA.org:uu-88292DiVA: diva2:145395
Available from: 2009-01-28 Created: 2009-01-28 Last updated: 2013-02-08Bibliographically approved

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Budd, Graham E.
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