Graptolite Paleobiology

The graptolites constitute one of the geologically most useful taxonomic groups of fossils for dating rock successions, understanding paleobiogeography and reconstructing plate tectonic configurations in the Lower Palaeozoic. Graptolites were largely planktic, marine organisms, and as one of the first groups that explored the expanses of the world's oceans are vital for understanding Palaeozoic ecology. They are the best and often the only fossil group for dating Lower Palaeozoic rock successions precisely. Thousands of taxa have been described from all over the planet and are used for a wide variety of geological and palaeontological (biological) research topics. The recent recognition of the modern pterobranch Rhabdopleura as a living benthic graptolite enables a much better understanding and interpretation of the fossil Graptolithina. In the decades since the latest edition of the Graptolite Treatise, the enormous increase of knowledge on this group of organisms has never been synthesised in a compelling and coherent way, and information is scattered in scientific publications and difficult to sort through. This volume provides an up-to-date insight into research on graptolites. Such research has advanced considerably with the use of new methods of investigation and documentation. SEM investigation and research on ultrastructure of the tubaria has made it possible to compare extant and extinct taxa in much more detail. Cladistic interpretation of graptolite taxonomy and evolution has advanced the understanding of this group of organisms considerably in the last two decades, and has highlighted their importance in our understanding of evolutionary processes. This book will show graptolites, including their modern, living relatives, in a quite new and fascinating light, and will demonstrate the impact that the group has had on the evolution of the modern marine ecosystem. This book is aimed not only at earth scientists but also at biologists, ecologists and oceanographers. It is a readable and comprehensible volume for students at the MSc level, while remaining accessible to undergraduates and non-specialists seeking up-to-date information about this fascinating topic in palaeobiology.

Auteur

Jörg Maletz is a researcher based at the Freie Universität Berlin, Germany.

Contenu

List of Contributors vii

Preface viii

Acknowledgments x

1 Graptolites: An Introduction 1
Jan Zalasiewicz and Jörg Maletz

2 Biological Affinities 15
Jörg Maletz

3 Construction of Graptolite Tubaria 31
Jörg Maletz, Alfred C. Lenz and Denis E. B. Bates

4 Paleoecology of the Pterobranchia 50
Jörg Maletz and Denis E. B. Bates

5 Graptolites as Rock Components 76
Jörg Maletz

6 Graptolites and Stratigraphy 94
Jörg Maletz

7 Taxonomy and Evolution 111
Jörg Maletz

8 Bound to the Sea Floor: The Benthic Graptolites 124
Jörg Maletz

9 The Planktic Revolution 139
Jörg Maletz

10 Early Ordovician Diversity Burst 153
Jörg Maletz and Yuandong Zhang

11 The Biserial Graptolites 181
Jörg Maletz

12 The Retiolitid Graptolites 207
Jörg Maletz, Denis E. B. Bates, Anna Koz³owska and Alfred C. Lenz

13 The Monograptids 221
Jörg Maletz

14 Collection, Preparation and Illustration of Graptolites 244
Denis E. B. Bates and Jörg Maletz

15 History of Graptolite Research 254
Jörg Maletz

References 270

Index 311