REPORT OF THE STATE PALEONTOLOGIST I903 I7I 



Appalachian basin. In the Perce rock and its more northerly devel- 

 opment in the limestones of Grande Greve, we confidently look for 

 a solution of the questions of origin and derivation of the faunas 

 which represent the earliest Devonic life of the Appalachian basin, 

 and their path of migration once determined, evidence to infer the 

 outline of the continental borders and the definition of the water- 

 ways. 



In this brief sketch we have omitted from consideration through 

 lack of personal acquaintance, reference to the Siluric limestones 

 which occur in detached masses along the Malbay to the north, and 

 at spots Remote from Perce, along the southern coast. When these 

 have been studied in detail, the entire series will be found to present 

 an important supplement to our present knowledge of the factors of 

 that ancient time. 



