CONTENTS 



PAGE 



Introduction 1 



Present Physical Conditions and Vegetation 2 



Stratigraphy 4 



Southcrn Wyoming 4 



Northwestern Colorado 7 



Local Sections and Maps 9 



Composition of the Fiora 22 



Systematic Relationships 22 



Quantitative Analysis 23 



Leaf Characters 25 



Past Climatic Conditions as Indicated by the Flora 27 



Correlation 31 



Summary 36 



Systematic Palteobotany 38 



General Procedure 38 



Synonyms and Changes of Names 40 



Descriptions 43 



