182 Forty- SIXTH Report on the State Museum, 



ality, sent Mr. McGee, the cartographer of the United States 

 Geological Survey, to Albany, and for some weeks we worked 

 together upon the preparation of the map, with the data which 

 had been accumulated, as above stated, and from all other 

 available sources." 



As the work progressed, it was found that the base-map pre- 

 viously used was quite inadequate for the purpose of laying down 

 the limits of the geological formations with the necessary degree 

 of accuracy ; and a new base was begun and finally constructed 

 under the auspices of the United States Geological Survey office, 

 and under the supervision of Mr. McGee. Upon this map was 

 laid down the geology of the State so far as accurately or 

 approximately determined. The title of this map is : 



Preliminary Geologic Map 



of 



NEW YORK, 



Exhibting the Structure of the State so far as known. 



Prepared under the Supervision 



of 



JAMES HALL, 

 State Geologist, 



by 



W. J. McGee. 



Scale 1:300,000. 



1885. 



To which I have added the following legend : 



"Engraved and colored by direction of J. W. Powell, Director of the United 

 States Geological Survey, for the use of the State Geologist of New York, for 

 his report of 1884, being the map referred to in a resolution of the Regents of 

 the University of the State of New York, January 7, 1885, and afterwards 

 communicated to the Legislature in February, 1885, with the annual report of 

 the State Geologist for the year 1884." 



This map, in its manuscript form, was brought before the 

 Board of Regents in January, 1885, with the statement that the 

 Director of the United States G-eological Survey had offered to 



