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TABLE OF CONTENTS 



I. Principles of Classification and Correlation of the 



Pre-Cambrian Rocks i 



By Charles Richard Van Hise 



II. The Basis of Pre-Cambrian Correlation .... 9 



By Frank D. Adams 



III. Evolution of Early Paleozoic Faunas in Relation to 

 Their Environment 28 



By Charles D. Walcott 



Paleogeographic Maps of North America — Early Cam- 

 brian AND Late Cambrian 38 



By B.ailey Willis 



IV. Physical and Faunae Evolutio.v of North America 

 During Ordovicic, Siluric, and Early Devonic Time . 44 



By Amadeus W. Grab.\u 



Paleogeographic Maps — Ordovktan and Silurian. . 88 

 By Bailey Willis 



W. Correlation of the Middle and Upper Devonian and 



THE MiSSISSIPPIAN FaUNAS OF NORTH AMERICA ... 92 



By Stuart Weller 



Paleogeographic Maps — Devonian and Mississippian . 121 

 By Bailey Willis 



VI. Upper Carboniferous . 124 



By George H. Girty 



VII. The Upper Paleozoic Floras, Their Succession and 



Range 139 



By David White 



Paleogeographic Maps — Pennsylvanian . . . . 161 

 By Bailey Willis 



VIII. The Faunae Relations of the Early Vertebrates . 163 

 By S. W. Williston 



Paleogeographic Maps — Latest Paleozoic, Triassic, 



and Late Jurassic 176 



By Bailey Willis 



vii 



