THIRD REPORT OF THE DIRECTOR I906 1 3 



Surficial geology 



The field investigation of the glacial and postglacial geology of 

 the State has been carried forward in the northern Hudson and 

 Champlain valleys, in the Mohawk valley and in western New York. 

 Most of this work is in direct continuation of operations already 

 begun and in considerable measure reported. We have in press 

 at this time reports by Professor Fairchild on the Glacial Waters 

 of the Erie Basin, the Dninilins of Central-Western New York, 

 and by Professor Woodworth on Postglacial Faults in Eastern New 

 York; a further report by Professor Fairchild on the Later Glacial 

 Waters of Central New York awaits publication. 



Schuylerville quadrangle. Reference was made last year to 

 the inauguration of a survey of this special district by Prof. J. B. 

 Woodworth and this work has now progressed to its completion. 



Cobblestone Hill beaches. This is a special investigation of 

 a series of marine beaches in Clinton county executed by Professor 

 Woodworth and now completed. 



Moraines of western New York. The mapping of these 

 features has been well advanced and will be prosecuted to com- 

 pletion by Professor Fairchild. 



Shore lines of Lake Iroquois, and Pleistocene geology west of 

 the Adirondacks. The examination and determination of these 

 problems are in the charge of Professor Fairchild and are advanc- 

 ing with adequate despatch. 



Pleistocene phenomena of the Lower Mohawk valley. Prof. 

 A. P. Brigham has undertaken the mapping of the glacial deposits 

 on the Amsterdam, Broadalbin, Gloversville and Fonda quad- 

 rangles. 



Northville is near the north line of the district and Duanesburg 

 and Sloansville are close to the southern boundary. Along the 

 river the area extends from the Noses, to about Rotterdam Junc- 

 tion. Thus the southern Adirondacks, the Mohawk valley and the 

 northern parts of the Catskill Plateau are represented, and the 

 study of the area will relate itself closely to the work accomplished 

 by Prof. J. B. Woodworth and others in the Hudson valley. 



Most of the time at disposal has been given to mapping in detail 

 and the formations have been thus delineated over the greater part 

 of the Broadalbin quadrangle with beginnings ou the three remain- 

 ing quadrangles of the group. 



Marked diversity appears in the thickness of the drift mantle. 

 Thus the deposits are unusually heavy in the immediate valley of 



