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OverviewDuring an expedition in Sonora, Mexico, palaeontologist Mark McMenamin unearthed fossils of creatures dated at approximately 600 million years old. These circular fossils, which are known as Ediacarans, seemed to defy explanation. This book documents their discovery. The Ediacarans were a marine life form that existed in Precambrian times, as much as 50 million years before life on earth began to diversify rapidly. Bearing a perhaps superfical resemblance to the jellyfish, the Ediacarans had a quilted body with three curving arms at the centre and a fringe of fine radial lines. McMenamin's curiosity was fuelled by the question of whether the Ediacarans were animals or some other type of organism. How could complex forms of life appear without respect to adaptation, without extensive records of prior evolution? This, it seemed, was exactly what the Ediacarans had done. This book details McMenamin's trip to Namibia, where, with a party including palaeontologist Adolf Seilacher, he investigates a cast made from a colony of fossils in the Nama desert. He chronicles the long, often futile search made by earlier scientists for Ediacara, which began more than a century ago in South Australia, and of the various types of Ediacaran fossils that have been uncovered since. McMenamin concludes that although they were related to animals, Ediacarans were not animals in the strict sense, because they never passed through the embryonic stage that is peculiar to known animal life forms. But they seem to have developed a central nervous system and brains independent from animal evolution. This finding has ramifications for our understanding of evolutionary biology, for it indicates that the path toward intelligent life was embarked upon more than once on this planet. Full Product DetailsAuthor: Mark McMenaminPublisher: Columbia University Press Imprint: Columbia University Press Dimensions: Width: 15.90cm , Height: 2.30cm , Length: 23.50cm Weight: 0.610kg ISBN: 9780231105583ISBN 10: 0231105584 Pages: 368 Publication Date: 15 April 1998 Audience: Professional and scholarly , Professional & Vocational Format: Hardback Publisher's Status: Out of Print Availability: Awaiting stock Table of ContentsReviews[A] thought-provoking personal exploration of what the Ediacaran fossils represent. -- Tree Author InformationMark A. S. McMenamin is professor of geology at Mount Holyoke College. He is the author of a number of groundbreaking books on paleobiology and evolution, including The Emergence of Animals: The Cambrian Breakthrough and Hypersea: Life on Land (with Dianna L. S. McMenamin), both published by Columbia. He edited and annotated the English translation of Vladimir Vernadsky's The Biosphere, and is also the coeditor (with Lynn Margulis) of the English translation of L. Khakhina's Concepts of Symbiogenesis. Tab Content 6Author Website:Countries AvailableAll regions |