iv DEDICATION. 



Laws of 1892, has made provision for the completion of this and the subse- 

 quent volume. The present volume is the first fruit of that act, and I trust 

 that its publication may give you personal satisfaction, and that it may com- 

 mend itself to the student of geological science and prove worthy of a place 

 among the great series of works comprising the Natural History of the State 



of New York. 



I have the honor to remain. 



With great respect, 



Your obedient Servant, 



JAMES HALL, 



State Geologist. 

 Albany, N. Y., May ISth, 1892. 



