CONTENTS 



Prefatory note 5 



Introduction 6 



Chapter 1 



Stratigraphic structure of Becraft mountain .... 6 

 Chapter 2 



Description of the fauna 15 



Vertical range of species 65 



Faunal values of species 68 



Chapter 3 



Nature and distribution of the Oriskany fauna in New York 72 



Distribution of the calcareous fades 72 



Ulster county 72 



Orange county 75 



Albany and Schoharie counties 77 



The original Oriskany sandstone 78 



Fauna of the Gaspe limestones ...... 80 



Chapter 4 



The Devonic age of the Helderbergian fauna and the base 



of the Devonic system in New York .... 82 



1 the argument from correlation ..... 83 



2 the argument from the intrinsic character of the fauna 83 



3 the argument from stratigraphy 95 



Fauna of the Manlius limestone ..... 98 



Explanation of plates 103 



Index . 122 



