Economic and Geologic Map, 



The map which accompanies this bulletin was prepared to 

 illustrate the report of the Superintendent of the Scientific 

 Exhibit of the State of New York at the World's Columbian 

 Exposition and is intended to show the distribution of the prin- 

 cipal mineral deposits which are of economic value. 



As a geologic base was necessary to the proper differentiation 

 of the formations which are of economic importance, and as no 

 geologic map of New York had been published since 1844, the 

 want could only be supplied by the compilation of a new one. 

 Since but little time was available for this purpose, in conse- 

 quence of the fact that the report on the Exhibits of New York 

 at the World's Fair was already in press when the Superintendent 

 was asked to contribute the map, it is not to be expected that 

 errors have been entirely avoided, and the incomplete state of 

 geologic knowledge has left many gaps which in the present 

 map have been filled by inference, but the belief that this map 

 will be of practical use to teachers, students and business men 

 throughout the State leads the author to publish it without pro- 

 longed apology for unavoidable inaccuracies. Those who wish 

 for more minute information concerning the distribution of the 

 geologic formations of New York are referred to the new geo- 

 logic map of the State now in preparation by the State Geologist, 

 Prof. James Hall. This will be on a very much larger scale and 

 will show more clearly and accurately the geologic detail. 



The work of preparing the geologic base for the economic map 

 has brought to light serious deficiencies in our knowledge of the 

 geologic formations of New York State. 



Although New York is the mother state in geologic nomen- 

 clature and contains a more complete and extensive series of the 

 formations below the carboniferous than any other state, and 

 although the rocks have been studied for more than sixty years 

 by professional geologists and students, our recorded knowledge 



