FIFTH REPORT CF THE DIRECTOR I908 



123 



geology was also represented in the decade by H. L. Fairchild's 

 maps on the glacial geology of western New York. Since 1900 

 the progress in mapping the geology has proceeded rapidly along 

 all lines, numerous areal, economic, stratigraphic, paleogeographic 

 and pleistocene maps all having been published. The main efforts, 

 at present, are toward a complete geologic map of the State using 

 the quadrangles surveyed by the United States Geological Survey as 

 a base, and a number of such quadrangles have been published. In 

 this way, piece by piece, like the forming of a mosaic picture, the 

 detailed geology of the State is being worked out. 



The last complete map of the State was the 1901 map by F. J. H. 

 Merrill corrected up to date from the Hall-McGee map of 1894. 

 This represents the results of all the geologic work done previous 

 to that time and is a fitting map with which to compare the earlier 

 efforts of McClure and Eaton. 



We have now reached the hundredth anniversary of the geologic 

 map of the United States and incidentally of this State, and al- 

 though there is yet much to be done, the work from now on must 

 be of detailed character and we may expect no great changes in 

 the general map. We have reviewed the five complete maps : the 

 McClure 1809, the Eaton 1830, the 1842 map, the Hall map of 

 1894 and lastly the Merrill map of 1901, and we have also noted 

 the smaller sections mapped by counties, townships and even 

 quadrangles. 



In making up the chronological list the date given on the margin 

 indicates the date of publication, and does not represent the date 

 on the map or the year of which an annual report is a review, 

 these dates where given having been inclosed in parentheses. Under 

 the years the maps are arranged alphabetically by authors. 



The author has aimed at getting together all geologic maps deal- 

 ing with New York State geology. It is realized that some have 

 probably been overlooked, but all of importance are probably in- 

 cluded. Many maps used in textbooks and other such literature, 

 which are evidently but copies of some maps listed here, have pur- 

 posely been omitted. Maps of the United States and other large 

 maps simply including New York State as a portion of a larger 

 area have been listed but sparingly, only the more interesting of 

 such having been examined. Following the chronologic list is an 

 index by means of which, it is hoped, the maps dealing with a 

 certain section of the State or maps by certain authors can readily 

 be located in the chronologic list. 



