GLACIAL STRLE. 709 



Lehigh coal sheds, about 6 miles east of Buffalo, accompanies Bishop's 

 report. Several acres were stripped of drift to expose the rock, which was 

 used as a floor for the sheds. The surface, though iu places shghtly 

 undulating, is well polished, and sharp grooves are numerous. 



Gilbert's recent studies of glacial sculpture iu western New York^ have 

 brought to light numerous exposures of glaciated ledges, about fifteen of 

 which are along the brow and face of the Niagara escarpment between 

 Lockpoi-t and the Niagara River. Evidence has also been found that the 

 shales to the north have been furrowed by the ice on a grand scale, the 

 furrows being in some cases at least 40 feet in depth and hundreds of feet 

 in width. These great furrows have a southwestward trend or bearing 

 similar to that of the striae on the hard rocks of the region. 



Fairchild has found, near Rochester, two sets of striae, an older, main 

 set with a bearing S. 40° to 60° W., and a later, light striation, hardly more 

 than a polishing, with a bearing S. 5° to 15° W. on the west side of the 

 Genesee, while they are slightly east of south on the east side of the river. 

 He considers the latter set of similar age to the Albion moraine and calls 

 attention to the fact that their direction is about perpendicular to the arc of 

 the moraine. It is not certain, however, that such a phase of striation 

 might not accompany the production of a spur since the ice is liable to be 

 to some extent lobed on each side of a spur and to have more or less move- 

 ment toward it. The movement in connection with the Pinnacle Hills 

 ridge would naturally be stronger toward the north side than toward the 

 south, since the main body of ice stood on that side, and probably had a 

 movement southward as well as westward. 



'Bull. Geol. Soc. America, Vol. X, 1899, pp. 121-130. 



