1 66 Report of the Brown-Harvard Expedition. 



been subjected to sea-action since the boulders were de- 

 posited during the glacial epoch. This criterion was inde- 

 pendently discovered by Dr. Daly, though he finds that it is 

 not the first time that it has been used. 



Third, the measurement of the upper limit of sub- 

 mergence. This was accomplished at almost all the local- 

 ities we visited, with the results outlined above. 



(2) Phenomena of glaciation. In this field many new 

 discoveries were made, including: 



First, large numbers of heretofore unobserved glacial 

 strise and grooves. 



Second, a considerable number of terminal and lateral 

 moraines, whose existence in Labrador had been doubted. 



Third, an upper limit to the extent of general glaciation 

 among the higher mountains of the north. Above 2,100 feet 

 there are no traces of alteration by the ice-sheet. 



Fourth, numerous new localities where lunoid mark- 

 ings occur, and an adequate theory of their origin, together 

 with definite proof of their connection with the movements 

 of the ice in the glacial epoch. 



Fifth, a great many fine examples of hanging valleys 

 in the vicinity of Nachvak — an efifect of glacial action not 

 previously known to exist in Labrador. 



Sixth, the determination of the direction of movement 

 of the main ice-sheet in the different localities; and evidence 

 that in the vicinity of Nachvak the glaciers followed the trend 

 of the local valleys, not covering the tops of the mountains. 



(3) The discovery of sedimentary rocks in localities 

 where none had been known previously; as, for example, the 

 breccias of Pomiadluk Point and the broad region of slate, 

 sandstone, and conglomerate on either side of Ramah. 



