578 11R. G. W. LAMPLUGH ON THE [Nov. 1 895, 



the rock-masses, including the crush-conglomerates, is about north- 

 north-east. But in passing down the Glen the general dip swerves 

 to the northward of north-west ; and between Sulby and Ramsey is 

 generally N. 10° to 20° W. This alteration has at first very little 

 effect upon the zone of brecciation, which continues to strike N.N.E. 

 until it leaves the Sulby valley. But farther eastward, its trend 

 swerves to about the same extent as the dip, the conglomerate-bands, 

 so far as can be made out, striking nearly S.W. and N.E., and thus 

 still preserving the obliquity of their relationship to the general 

 dip. 



The arrangement of the crush-material in parallel bands is 

 nowhere better seen than on Skyhill, the bold ridge between Glen- 

 tramman and Glen Auldyn. The weathered crags on the northern 

 crest of this hill show very clearly the gradual disruption of the grit- 

 bands ; while farther south three, or possibly four, separate zones of 

 the crush-structure, each narrower than the last, may with some 

 difficulty be traced, with wedges of more or less unbroken strata 

 between them. The north-eastern prolongation of the two most 

 northerly of these bands is lost in the low ground, but those south 

 of the Skyhill farmstead probably cross to the eastern side of Glen 

 Auldyn and extend thence across the plateau towards Ramsey. 

 Exposures may be seen in the ravine under the Skyhill farm, where 

 again the rock is traversed by dykes (see Mr. Watts's Appendix, 

 p. 596) ; and on a smaller scale in the bed of the tributary on the 

 opposite side of Glen Auldyn, north of the old lead-mine. But while 

 in the last-mentioned locality the material is presented as a series 

 of streaks a few feet across, it has in the next exposure, | mile 

 distant, in Elfin Glen immediately south of the town of Ramsey, a 

 breadth of outcrop of about 300 feet. If, therefore, these form 

 parts of the same band, a rapid expansion north-eastward is indi- 

 cated, which again would be explicable by presuming the plane of 

 brecciation to have been folded. 



Erom Elfin Glen the structure is prolonged towards the sea in 

 the broad ridge of Ballastowell, where it terminates within 150 

 yards of the coast-line against a low terrace of drift. Nearly the 

 whole bulk of this ridge, between Ballure Glen and the cliff-like 

 slope overlooking Ramsey, is composed of coarse crush-conglomerate, 

 the width of which, as measured on the map, is between 700 and 

 800 feet, and its depth, from the lowest to the highest point seen, 

 about 300 feet. The various stages in the formation of the struc- 

 ture by the shattering of flaggy sandy slates are beautifully exhibited 

 in the weathered crags east and west of the Albert Tower ; and the 

 material itself is extensively quarried as a building-stone at the 

 seaward end of the ridge. 



In the talus of a small quarry near the farmstead of Ballastowell, 

 on the summit of the hill, Mr. H. Bolton obtained the cast of a 

 trilobite, 1 referred to on a previous page. By the kindness of 

 Mr. Bolton I have been able to examine this specimen, and were it 



1 Geol. Mag. 1893, p. 29. 



