576 MK. G. AV. LAMPLTTGH ON THE [Nov. 1895, 



marked surfaces recorded among the older rocks will eventually be 

 found to be of this nature. 



(d) Sections east of Sulby Glen. — For the exposures between Sulby 

 Glen and the east coast a briefer description will serve. They are 

 essentially similar in character to those already described, but at a 

 few points important features not hitherto encountered will require 

 consideration. 



The section at Cronk Sumark, 1 or Primrose Hill, the crag rising 

 steeply above the drift in the expanded mouth of Sulby Glen, is 

 especially noteworthy. 



Thick-bedded, rather coarse-grained, contorted grits are slightly 

 exposed near the foot of this hill on the north-western side, while 

 40 or 50 feet higher on the opposite face a large quarry has been 

 excavated in a welded mass of obscurely-cleaved dark blue slate in 

 which some traces of folded bedding can in places be made out. 

 From the talus of this quarry Mr. H. Bolton has recorded the 

 fossil identified as Dictyomema sociale, referred to on a previous 

 page (565). 2 



At the southern edge of this quarry the brecciated structure sets 

 in, and extends thence eastward over the remainder of the hill, 

 being well exposed in the crags (as shown in fig. 1, p. 564), and in the 

 quarry behind the farmyard at Grangee, where large cubical crystals 

 of pyrites are very abundant, On the supposition of the deforma- 

 tion of the brecciated plane, this exposure could be regarded as lying 

 on the north-western side of an anticline striking across into Sulby 

 Glen. 



From Cronk Sumark the crush-material may be traced eastward 

 for i mile, into the cliff-like slopes of Kerroo Mooar overlooking 

 the northern plain, where it is intruded upon and altered by an 

 igneous rock (altered diorite or dolerite ; see Mr. Watts's Appendix, 

 p. 596) different in character from the Sulby Glen dyke. 



In Narradale, the most easterly of three small glens which flow 

 nearly parallel with the Sulby River, and after uniting join that 

 stream near Cronk Sumark, there is a very wide exposure of the 

 crush-conglomerate, extending from the ravine at Grangee south- 

 ward for rather over a mile, broken only by occasionally narrow 

 intercalations of bedded slate and by several ' greenstone '-dykes. 



In the right bank of the stream, south-west of the only farm- 

 stead in the upper part of the glen, there occurs a large, partially- 

 rounded, boulder-like mass of coarsish grit or quartzite, measuring 

 not less than 14 x 8 x 6 feet, apparently embedded in the con- 

 glomerate, and it is the largest rounded block that I have yet 

 seen in this position. Its surface is, as usual, coated with a smooth, 

 highly-sheared sericitic layer, to which little flakes of the breccia 



1 The name should probably be Cronk Shimmirk=the Hill of Eefuge. There 

 are traces of an old fortification on the summit. Being within \ mile of the 

 Sulby Bridge Railway Station, this hill is a very accessible locality for the study 

 of the crush-conglomerate. 



2 Eep. Brit. Assoc. (Nottingham) 1893, p. 771. The fossil is evidently 

 extremely rare, and my own repeated search has as yet been quite unsuccessful. 



