42 THE CANADIAN NATURALIST. [Vol. X» 



by ice- sheets sliding more directly down the slope into the Bay 

 depression at a later date. 



The third set of striae occurs in the district intervening be- 

 tween Petite Roche and Bathurst, which is about ten miles in 

 length. 



(1) A mile east of Petite Roche station along the Inter- 

 colonial railway, scratches appear on slate rocks, with a course of 

 about north 65^ east. The ledge is probably sixty feet above 

 sea level, and is rounded on the south-west slope. 



(2) At Mill Stream (north side), six miles from Bathurst, 

 grits and shales on the site of the railway are distinctly grooved, 

 the direction of the striae being north 65^^ east. The grooves 

 occur on a nearly level surface of rock, but afford evidence that 

 the ice-mass moved north-eastward. 



(3) On Knight's farm, three miles north of Bathurst, an 

 interesting group of striated surfaces was discovered about a 

 hundred yards east of where the railway crosses it. The rocks 

 are trap, felsite and conglomerate, and stand up a few feet above 

 the general level in the form of bosses or low rounded hills. 

 Their south-western sides are all ground off and polished. No 

 fine striae appeared, but I noticed a number of wide parallel 

 grooves or furrows which had nearly a north-east and south- 

 west course. Eight or ten of these rock-masses may be seen here 

 planed and grooved in the manner described, the stossing 

 invariably on the south-western slopes, while their north-eastern 

 faces are rough and have a broken-off appearance. It was from 

 an examination of these furrowed rock-surfaces that I was first 

 led to the conclusion that the direction of the ice-flow in the 

 district where the third set of strias occurs must have been from 

 south-west to north-east. 



On rocks a few hundred yards to the north of these, however, 

 I saw what might be taken as indications of glacial erosion on 

 the north-western slopes of one or two exposures. No striae or 

 grooves were observed, but merely a rounding of the faces ; and 

 it was difficult to say whether this was the effect of atmospheric 

 agencies or of ice. If these markings are due to the latter cause, 

 they would indicate that a glacier must have moved over this 

 region in a south-easterly direction at an earlier date than the 

 one whose striae I have noted. 



The elevation of the surface in this vicinity is about 100 feet 

 above the sea. 



