14 Ni'-W \()UK STATE Ml'SEl'At 



siderable lake existed in the vicinity of Johnsburg. It has also been 

 quite definitely i)rovc(l that, before the glacial e])och, the Hudson 

 river did not flow southward across the Luzerne region, but that its 

 course was past Warrensljurg and the south end of Lake (leorge 

 and thence toward (liens J^alls. 



Work on the Alt JMarcy quadrangle has been inaugurated by 

 Professor Kemp who with Doctor Ruedemann recently issued a 

 report on the Elizabethtown sheet. Mt Marcy lies next west and is 

 a region of complicated and rough topography. So far as this field 

 has been investigated there appears to be at the north a complicated 

 mixture of the anorthosites and Grenville strata, especially the 

 limestones of the latter. The region 'has afforded interesting con- 

 text zones with the characteristic lime silicates, wollastonite, garnet, 

 pyroxene and the like. 



Professor Hudson, who has been working as opportunity afforded 

 on the special survey of Valconr island, reports progress in the 

 execution of a topographic map with i meter contours and in the 

 solution of many problems which have arisen most unexpectedly 

 from the study of the latter unit — problems bearing on the greater 

 history of Lake Champlain and its origin, on the special effective- 

 ness of minor physical forces and on the life history of the fossil- 

 bearing formations of which the island is constituted. 



Southeastern New York. The survey of the Poughkeepsie 

 quadrangle has been carried to completion by Professor Gordon 

 and his report and map are now on the press. 



In the Highlands district Doctor Berkey has studied three typical 

 areas with special care and with laboratory aids in an effort to 

 establish satisfactory subdivisions of the older crystalline series. It 

 has been found possible to determine the sedimentary origin of an 

 occasional rock and the igneous origin of certain others beyond 

 reasonable doubt. Many of the strongly foliated gneisses are, 

 however, practically indeterminable. It seems desirable to make 

 these distinctions in the areal work of the Highlands wherever the 

 types are developed on large enough scale. Chemical and micro- 

 scopic studies have been made in connection with this work, and a 

 special study is being made of the Cortlandt series in still greater 

 detail. 



Portions of the Tarvytcn^ni ([uadrangle and its geology have been 

 reviewed with the intention of securing conformity with the later 

 interpretations of formational relationships. The original field 

 work on that (juadrangle was done before some of these relations 



