174 PROCEEDINGS OP THE ALBANY MEETING 



regular intervals of about 30 miles each along the outcrop, thus indicating a 

 series of gentle swells in the Silurian strata which have been truncated in the 

 Onondaga transgression. 



It is claimed that the name Bertie should either be retained in the primi- 

 tive sense, covering the entire series inclusive of the Akron, or else be restricted 

 to the cement bed here called the Buffalo, a name said to be preoccupied. The 

 correlation eastward of the Akron with the Cobleskill remains to be worked 

 out anew, but it is now believed to be substantially correct. 



Presented in full extemporaneously. 



Brief remarks were made by Prof. A. W. Grabau and Miss M. O'Con- 

 nell ; also by Mr. M. Y. Williams, who said : 



I wish to make a plea for the continued use of the term Bertie. At the type 

 locality it was clearly used to include the beds below the Akron dolomite and 

 above the Camillus shale, although the shale is not exposed. I see no diffi- 

 culty, therefore, in continuing its use as above, which is the usage adopted by 

 Professor Grabau in Bulletin 45, New York State Museum. 



SUMMARY OF GEOLOGIGAL INVESTIGATIONS CONNECTED WITH THE 

 CAT SKILL AQUEDUCT 



BY CHAELES P. BERKEY 



{ATjstract) 



The work of construction of the Catskill Aqueduct, so far as it relates to 

 geological investigations and discoveries, is practically completed. The only 

 portion which is likely to add data is the newly projected Schoharie supply. 

 Even here preliminary investigations are almost completed ; but the construc- 

 tion of the Gilboa Dam and the eighteen-mile tunnel projected through the 

 Catskill Mountains from the Schoharie to the Esopus watershed is not yet 

 begun. 



All of the work from Ashokan reservoir to and through New York City, 

 however, has been completed ; and it is now possible to compare the geological 

 interpretations given during the time of exploratory investigation with the 

 actual results proven under construction. The New York City Board of Water 

 Supply has assigned the writer to the task of preparing a summary of the 

 geological findings. It is proposed to write a final volume covering this special 

 field, with an attempt to show the intimate connection between the geological 

 findings and the modification of plan and ultimate success of the different 

 parts of the enterprise. 



This piece of work is one of the most prominent in the history of large engi- 

 neering enterprises for the close cooperation of engineers and geologists, and 

 it is one in which the variety of problems is great enough to make it useful as 

 an illustration of the interdependence of geology and engineering. 



The brief discussion given was confined to a few typical illustrations of this 

 close relation between the plans of the engineering work and the conditions 

 interpreted from the geology. 



Presented in ahstractt extemporaneously. 



