New York State Museum 



GEOLOGY 



The work of the state geologist during the 10 months which 

 have elapsed since his appointment Jan. 1, 1S99, to succeed the 

 late Prof. James Hall, has been prosecuted under his direction 

 by seven field assistants. The investigations in progress are 

 naturally grouped in three divisions, pure geology, economic geol- 

 ogy and the preparation for the graphic expression of both in the 

 new edition of the geologic map. 



Southeastern Xew York 



The work in pure geology has been chiefly devoted to the study 

 of the crystalline rocks in Xew York, Westchester and Putnam 

 counties and specially directed toward the completion of those 

 particular studies on the crystalline rocks of southeastern Xew 

 York begun by the present state geologist in 1S81 and continued 

 at intervals since that time. Some results of this work have 

 already been published under the titles of ,; Metamorphic strata 

 of southeastern New York," 1 " Geology of southeastern Xew 

 York," 2 etc. This work has been of particular value in view of 

 the large commercial and educational interests now centered in 

 the enlarged area of X'ew York city and has been carefully 

 elaborated, with a view to the development of fuller detail and 

 accuracy in the geologic maps of Greater Xew York. 



The investigation of the crystalline rocks of Westchester and 

 Xew York counties has been carried on during the past field 

 season by Mr Edwin C. Eckel, who deserves credit for his 

 energy and the accuracy of his observations. Mar. 6, 1899, he 

 commenced field work in southeastern Xew Y'ork. From that date 

 till April 20 he was engaged in visiting and mapping such out- 

 crops of the crystalline rocks as are now visible on Manhattan 

 island. The rapid northward growth of Xew York city has re- 

 sulted in the obliteration of many of the outcrops formerly noted, 

 while excavations for streets and the foundations of buildings are 

 continually furnishing new exposures, many of which are of con- 



lAm. jour. sci. 3d ser. 39: 3S3-92. 

 2 50th an. rep't N. Y. state mus. 



