RECENTLY EXPOSED NEAR BEAUMARIS. 



473 



denly became extremely coarse, 

 the felsite fragments being some 

 9 inches in diameter ; the gene- 

 ral appearance suggests that this 

 may be an agglomerate rather than 

 a conglomerate. There is also a 

 dyke of a compact dark rock with 

 scattered crystals of whitish fel- 

 spar often about half an inch long, 

 resembling very closely a dyke in 

 a quarry above the Bangor Ceme- 

 tery *. Beyond this spot, for 

 some distance the drive crosses an 

 open field, and the slope is over- 

 grown with vegetation of long 

 standing ; so, as there was no pro- 

 bability of any more exposures that 

 would be of interest, I did not 

 follow it further. On the crest of 

 the ridge, about 150 yards to the 

 N.W. or W. of the above rocks, is 

 schist of the ordinary type. 

 . I have examined five slides cut 

 to illustrate this series of grits : — 

 one, from the mass nearest the 

 schists,to represent the normal rock 

 of this part ; another, from near the 

 same, to examine more especially 

 the included fragments ; a third 

 from the greenish grit associated 

 with argillite, near the bridge on 

 the western side ; and a fourth to 

 illustrate the red felsite grit east 

 of the bridge, cut from a part 

 where the fragments are often 

 about the size of small peas. "We 

 find, in these, grains of quartz, fel- 

 spar, and several varieties of tra- 



* I hare not examined this microsco- 

 pically, as I could not have got a speci- 

 men worth cutting without much de- 

 facement of the ice-worn surfaces. The 

 " Cemetery " dyke lias in its ground- 

 mass a considerable family likeness to 

 the one already described, but is a little 

 coarser, and the augite is better pre- 

 served. The larger felspar crystals ap- 

 pear to be of the same species as those 

 in the ground-mass, but are more de- 

 composed, and partly replaced by secon- 

 dary microliths. 



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