New York State Education Department 



New York State Museum 



JOHN M. CLARKE, Director 



Memoir 9 

 EARLY DEVONIC HISTORY 



NEW YORK AND EASTERN NORTH AMERICA 



BY 



JOHN M. CLARKE 

 PART 2 



INTRODUCTION 



These papers bring together additional results of studies inaugurated 

 for the purpose of establishing a fuller basis of comparison between the 

 early Devonic faunas of New York and those of the regions bordering the 

 Atlantic coast line. In large measure the data here presented are purely 

 paleontological and faunal as I have not taken occasion in connection with 

 the examination of the region here involved to enter into detailed con- 

 sideration of problems of regional structure. The work pertains to the 

 same line of investigations as those set forth in part i of this memoir, and 

 contributes thereto a series of factors which cast light upon the prob- 

 lems of composition and origin of these ancient faunas. It is almost need- 

 less to remark that so long as the exact nature of the species composing the 

 faunas of this early period remained unknown, suggestions in regard to the 

 true succession of events, the outline and modification of the coast lines of 

 the time and the general courses of migration must remain unsubstantiated 

 hypotheses. Hence paramount importance has been given to the examina- 

 tion and identification of the species as a necessary stepping-stone to any 



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