REPORT OP THE DIRECTOR AND STATE GEOLOGIST 1903 7 



mapping of that poTtion of Westchester co. included in the 

 Oyster Bay quadrangle. 



Two weeks were spent in the Berkshire region and two weeks 

 more in the study of the pre-Cambrian and other crystalline rocks 

 on the sho'res of Long Island sound between New London on the 

 east and Fairfield on the west. 



Then, returning to Pittsfield, some further time was spent in 

 reconnaissance trips from Williamstown on the north to South 

 Norwalk on the south and eastward as far as Springfield. In the 

 course of this work much benefit was derived from conferences 

 with Professors Dale at Pittsfield, Oleland at Williamstown and 

 Gregory at New Haven. 



This wofk has been necessitated by the great mass of geologic 

 investigation carried on in western New England during the past 

 15 years, on formations in part identical with those of south- 

 eastern New York. 



In the Adirondack region, Prof. H. P. Gushing had pTepared to 

 continue his work of previous seasons, but during the past 

 summer the heavy rainfall rendered field work in the woods 

 impossible except on comparatively few days. It had been 

 intended to finish the mapping of the Long Lake sheet; but, for 

 the above reason, only about half of the work was completed. In 

 the area covered, attention was mainly centered on the hard 

 geology, and the experience of previous seasons was corroborated 

 in that the anorthosite was found, in this district, to grade 

 invariably into a gneissoid gabbro along its border and to become 

 involved with, and apparently cut by, a gneissoid and rather basic 

 phase of the adjoining syenite. Later, a short visit was made to 

 the Little Falls region to clear up one or two points connected 

 with its geology. 



In the office the areal mapping of the Little Falls sheet has been 

 transferred by Professor Gushing to the revised map of that quad- 

 rangle, which has recently appeared, and the maps transmitted 

 for publication. A short report on the petrography of the 

 Northumberland rock was transmitted by him for publication in 

 the 21st Annual Report of the State Geologist. Much time during 



