8 NEW YORK STATE MUSEUM 



the year was devoted to the preparation of a report on the geology 

 of the northern Adirondack region; and it is well advanced 

 toward completion, so that it will be forwarded for publication 

 early next spring. 



Pleistocene 



During the field season of 1903 Professor J. B. Woodworth con- 

 tinued his work on the Pleistocene geology of the eastern part of 

 the State. Work was begun in the month of April on the remap- 

 ping of the Harlem and Brooklyn quadrangles, Mr J. W. Gold- 

 thwait bein^ charged particularly with the detailed mapping of 

 the outcrops of bed rock not heretofore shown on geologic maps. 

 This Avork was advanced by Mr Goldthwait during the summer 

 season to the point of showing in detail the surface geology of 

 the major part of the southern half of the Harlem quadrangle and 

 that of the Brooklyn sheet except the area within the city of 

 Brooklyn. The plan of showing the position of the hundreds of 

 small rock exposures in the former area as an index to the dis- 

 tribution of the thin till, rendered the field work necessarily slow. 

 Mr Goldthwait, on account of illness, was forced to leave the 

 field in the middle of August and has not since returned to it. 

 The glacial striation in the mapped portion of the Harlem area 

 was studied in detail and, through the occurrence of newly made 

 sections, some advance was made in differentiating into definite 

 categories, deposits of drift which heretofore have been repre- 

 sented as undifferentiated glacial materials. Another season^s 

 field work will be required to complete the area undertaken. 



Several days were devoted by Professor Woodworth during the 

 spring and summer to following the progress of the borings made 

 ini the western part of Long Island by the Commission for Addi- 

 tional Water Supply. The sections thus obtained threw much 

 additional light on the structure of the outwash plain, particularly 

 in the area of the Hempstead sheet. A detailed investigation 

 was carried on at the same time in the area by the United States 

 Geological Survey, a preliminary report of the observations of 

 Vhich, including data from many deep wells privately undertaken, 



