3 



\^B^ 



CONTENTS. 



Page. 



Introduction 39 



Tlie ( onviii formation 39 



Plant collccl ions 40 



Age of the plant-bearing beds 41 



Distribution of Jiirassic floras 43 



Geograpliie range 43 



Means of dispersiil 45 



Avenues of dispers;il 45 



Probable climatic conditions 46 



The flora 46 



ILLUSTRATIONS. 



rage. 

 PilAtes V VIII. JuTaaidc ikfra of Cape Lisburne, Alaska 57-64 



II 



