Contents

Text Figures vii Text Tables ix Foreword xi Preface xv

Chapter 1

BACKGROUND INFORMATION 1

Historical Notes 1

Trilobite Names 2

Chapter 2

THE BIOLOGY OF TRILOBITES 4

Exoskeleton 4 Ontogeny 13 Soft Body Parts 17 Life-Mode 21

Evolution and Cladistics 30 Chapter 3

TAPHONOMY 32

Death, Decay, and Disarticulation 32 Transport and Reorientation 35 Fragmentation and Biased Preservation 36 Abrasion, Corrosion, and Encrustation 37 Fossil Diagenesis: Geochemical Processing of

Potential Fossils 37 Trilobite Taphofacies 40 Trilobite Lagerstatten 40

Chapter 4

THE PALEOZOIC GEOLOGY OF NEW YORK 43

Overview 43 Cambrian Period 46 Ordovician Period 56 Silurian Period 81 Devonian Period 95

Chapter 5

THE TRILOBITES 117

Order Agnostida 117 Order Redlichiida 118 Order Corynexochida 118 Order Lichida 124 Order Phacopida 128 Order Proetida 148 Order Asaphida 157 Order Ptychopariida 163

Appendix A: Trilobites and Their Environments 168

Appendix B: The Photography 170

Glossary 172

References 177

Trilobite Index 191

Index 201

Plates 204

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