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Objectives Geologic setting Previous work Fossil collections Acknowledgments -_Biostratigraphy Composition of Whitehall fauna Trilobites --_ Gastropods  -__ Other fossils Age and correlations Problems and methods Saukia Zone Missisquoia Zone Symphysurina B Zone ( ?) Cambrian-Ordovician boundary Summary Environmental setting  ----Petrology  _ Inferred environments Biofacies distribution ~odels ~ethods of analysis Assemblages similar to Whitehall fauna  _ Assemblages dissimilar to Whitehall fauna ____ _ CONTENTS

Systematics, environment, and biogeography of some Late Cambrian and Early Ordovician trilobites from eastern New York State