r8 NEW YORK STATE MUSEUM 



regarded as a down faulted portion of the region. These larger 

 Grenville areas here would seem to emphasize the correctness 

 of that conclusion. In addition, two or three small patches of 

 Grenville rocks, previously unknown, were discovered. 



Glacial striae were noted in several places, always in valleys, 

 and on surfaces recently stripped during road-making. They, 

 as usual, show directions controlled by the minor topography 

 and are of little value as indications of the general direction 

 of movement of the main ice sheet. 



In southeastern New York work has been continued in the 

 study of the crystalline rocks by Mr E. C. Eckel. During October, 

 and November 1901 he was chiefly in Rockland and Westchester 

 counties, short trips having been made into the adjoining 

 portions of Connecticut and a few days being spent in the 

 vicinity of Fort Ann N. Y. The winter was occupied with 

 proof-reading on bulletins, and with the editing of reports 

 on the Portland cement industry of the State and on the quarry 

 industry of southeastern New York. During the spring and 

 summer of 1902, Mr Eckel was engaged in field work on the 

 Cambrian and Silurian formations in Columbia and Dutchess 

 counties; on the pre-Cambrian and Paleozoic formations near 

 Saratoga N. Y.; and in establishing points on the boundary 

 lines between the Medina, Clinton and Niagara formations in 

 western and central New York. 



In Pleistocene geology, work has been continued in the Hud- 

 son and Champlain valleys by Prof. J. B. Woodworth in the 

 study of the history of the postglacial marine invasion. During 

 the winter and spring of 1901-2 he was engaged in the elabora- 

 tion of his field notes and in the preparation of parts of a 

 report on the evidences of submergence of the Hudson and 

 Champlain valleys by the sea or by fresh water at the close 

 of the glacial period. A short paper on the Northumberland 

 volcanic plug was prepared with illustrative drawings, and is 

 now in the hands of the printer. 



June 16, 1902, Professor Woodworth went into the field and 

 till the 28th of the month remained in the Hudson valley be- 

 tween Kingston and Newburg, studying the terraces of clay, 



