On New Species of Fossil Sponges From the Siluro-Cambrian at Little Metis on the Lower St. Lawrence [microform]
On New Species of Fossil Sponges From the Siluro-Cambrian at Little Metis on the Lower St. Lawrence [microform]

Author: Sir J W (John William) Dawson

Publisher: Legare Street Press

Published: 2021-09-09

Total Pages: 32

ISBN-13: 9781013972508

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This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

The Great Ordovician Biodiversification Event
The Great Ordovician Biodiversification Event

Author: B. D. Webby

Publisher: Columbia University Press

Published: 2004

Total Pages: 497

ISBN-13: 0231126786

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Two of the greatest evolutionary events in the history of life on Earth occurred during Early Paleozoic time. The first was the Cambrian explosion of skeletonized marine animals about 540 million years ago. The second was the "Great Ordovician Biodiversification Event," which is the focus of this book. This is the first book devoted specifically to establishing the global patterns of differentiation of Ordovician biotas through time and space. It provides extensive genus- and species-level diversity data for the many Ordovician fossil groups and presents an evaluation of how each group diversified, with assessments of patterns of change, and rates of origination and extinction.