268 ROYAL SOCIETY OF CANADA 



noteworthy feature is that the breccia has forced or eaten its way between 

 the beds of limestone near the top of the wall. (See fig. 14.) 



In the northeast well of the quarry there is a large dyke, ISTo. 14, 

 seven feet wide, composed of a great variety of clastic materials. Filled 

 amygdules are also very abundant and show an arrangement in rude 

 lines somewhat parallel to the sides of the dyke. It was at first thought 

 to belong to the series of breccia dykes, but the petrography shows it to 

 be a pyroxenite and of a quite different character. The pyroxenite cuts 

 a small camptonite dyke which meets it on the north side at an angle of 

 30°. On the road about thirty paces to the east there is another exposure 

 of pyroxenite similar to the large dyke. Between these two occurrences 

 of pyroxenite there is another dyke with similar strike, N. 15° E. This 

 dyke (slide No. 16), is two feet wide, fine grained, weathering pinkish 

 gray. It contains fragments of granite, gneiss, essexite and limestone, 

 the latter weathering out leaving angular cavities. About nine chains 

 to the south, a three foot dyke (slide No. 21), is found having approxi- 



Fig. 14. 



mately the same strike, N. 6° W., and with other features the same as 

 the last. It, too, contains fragments chiefly limestone, but with syenite 

 and sandstone also. These two dykes are composed of the same igneous 

 material as the cement of the breccia. 



Northwest of Little's quarry a patch of breccia outcrops beside Bel- 

 videre Road, (Slides Nos. 18 and 19.) This is cut by a nearly hori- 

 zontal dyke of bostonite, about eight inches thick. Another small patch 

 of breccia is found to the southeast of this last occurrence. 



The breccia at the Westmount quarry forms the largest patch of 

 this group. It is composed almost entirely of igneous material, inclu- 

 sions being relatively infrequent and not amounting to more than two 

 or three per cent of the whole mass. The inclusions present are, how- 

 ever, of much larger size than those of the other occurrences, some of 

 them being nearly two feet across; moreover, they show a tendency to 

 run in vertical lines, the rock on either side of these lines being free 

 from inclusions.! A few dykes cut the breccin, one of which was found 

 to be a typical camptonite. The wall of limestone between the road and 



1 Buchan, Can. Rec. Sc, 1901, p. 



