570 



MR. G. W. LAJIPLT/GH ON THE 



[Nov. 1895,. 



drift covers the surrounding hill-slopes, so that the prolongation 

 of the structure from this point cannot he directly traced ; hut the 

 exposure lies exactly in the line of strike of the similar material 

 found in Sulby Glen ; and as there is also other evidence to connect 

 them, I regard this as the southern extension of the Sulby Glen 

 zone. 



The first good section, however, in the Sulby basin itself lies about 

 3 miles farther north-north-east. Here in the bed of a rivulet 

 draining into the Druidale branch of the main stream, west of the 

 ruined farmstead of Close, there is an outcrop 150 yards in breadth ; 

 from this, by reason of the flaggy fracture of the rock along the 

 later shear-planes, excellent specimens of the crush-conglomerate 

 may be obtained. 



Northward from this point the exposures are practically con- 

 tinuous, and in the craggy walls of the rapidly deepening valleys 

 the material may be studied in every stage of its formation, and the 

 expanding zone traced almost without interruption down to the 

 mouth of the Glen, 5 miles distant. 



Fig. 3. — Sketch-section of strongly-banded sandy slate in eastern 

 bank of Sulby River, below Snaefell, 450 yards JV". of ' Lead- 

 mine.' (Length= about 5 feet.) 



N, W. 





S.E. 





A A. J3and of grit about f inch thick among puckered slates, crumpled^and 

 partially broken. - tir — -^ 



B B B. Isolated pebble-like fragments of grit, presumably detached or squeezed 

 out from the band A. 

 y-y y-y. Planes of strain-slip or close-faulting. 



z-z-z. Planes of the later shear-cleavage, striking N. 40° W. with the bedding, 

 but crossing the folds with a dip of about 30°. 



Five hundred yards below Close the conglomerate strikes into the 

 main stream ; and though here, as in a few other places in the Glen, 

 somewhat confused by later faulting, and by the presence of large 

 blocks of the unbroken strata in its midst, its general north-north- 

 easterly trend remains unaltered. 



Where Glen Crammag joins the main valley the conglomerate 

 forms the high craggy slope on the southern side of the river, and 

 extends backward for 300 yards up the bed of the feeder. 



Under the Druidale farmstead, \ mile farther north, the brecciated 

 zone is fully 500 yards in breadth, but includes some portions in 

 which the bedding-planes are only partially broken up. 



