REPORT OF THE DIRECTOR I915 2/ 



VI 



REPORT ON THE GEOLOGICAL SURVEY 



Apart from normal office duties, it has been possible to progress 

 active field work in geology but little during the past year. This 

 is due partly to abnormal demands made by the Museum equipment 

 and partly also to the failure of the Legislature to make a favorable 

 response to a request for appropriations which could be specifically 

 utilized for this object. Appeals for assistance from various 

 localities for intelligent direction in the development of their 

 geological resources have had to be put aside, and sources of 

 effective wealth neglected. 



AREAL GEOLOGY 



In the work directed toward the completion of the great geo- 

 logical map of the State on a scale basis of one mile to the inch, 

 some progress was made in the mapping of the Gouverneur 

 quadrangle by Prof. H. P. Gushing, this work covering about one- 

 tenth of its area and confined to its northeast portion. The forma- 

 tions found were the direct continuation of those of the Ogdens- 

 burg and Canton quadrangles, along the northeast-southwest strike 

 which prevails, and have been described in some detail in the 

 reports on those quadrangles which are about to be printed. Suffi- 

 cient area was not covered to warrant any statement of results. 



The Lake Placid quadrangle was covered in detail except for 

 about one-fourth of the area, by Dr W. J. Miller. Only a few 

 general results of this work can here be stated. 



A great variety of Precambrian rocks occurs within the quad- 

 rangle, usually being mixed in a very complicated manner. The 

 Grenville series, including various gneisses, some quartzite and 

 little limestone, is not extensively present, the largest area probably 

 being that south and southeast of Lake Placid village, but the drift 

 there is so heavy that exposures are scarce. Another considerable 

 body of Grenville occurs at the south end of Wilmington mountain. 

 Most of the other Grenville is scattered about in small masses. 



Anorthosite is very prominently developed, varying from the 

 typical coarse-grained, bluish gray rock consisting mostly of 

 labradorite of a dark-gray, somewhat finer grained, gneissoid, gab- 



