662 REPORT — 1894. 



direction of the -wliole motion at a greater rate than the higher layers, and thus 

 the stones, &c., on the sea bottom will be pushed up to their final reoting-place, 

 and anomalies of distribution might thus be accounted for by the previous dispersal 

 of the boulders. It was then shown that differences in shape of the ice-sheet and 

 its spreading out at the further end will make little difference in the argument, 

 and under certain conditions will aid the motion. 



The author then discussed the question of the glacial erosion of lakelets, and 

 indicated the conditions under which this is possible, particularly referring to the 

 difference between an ice-sheet such as that dealt with in the paper and an ordinary 

 glacier. 



8. Report of the Committee on the Elbolton Cave.— See Reports, p. 



9. Report of the Committee on the Calf-hole Cave. — See Reports, p. 272. 



TUESDAY, AUGUST 14. 

 The following Papers and Reports were read : — 



1. On the Permian Strata of the North of the Isle of Man. 

 By Professor Boyd Dawkins, F.R.S. 



The main features of the geology of the island are identical with those of 

 Cumberland and Westmoreland. The Ordovician strata form the ' massif in 

 both areas, and constitute the sea- worn floor upon which the Carboniferous rocks 

 rest unconformably. The Red Sandstone series of Peel, 1,368 feet in thickness, 

 occupies but a very limited area, extending from the Cveg Malin, along the sea 

 front, in a line of picturesque cliffs, about one and a half mile to the north-east, 

 and extending inland about 1,700 feet. The rocks may be divided into two distinct 

 groups. First, the Peel Sandstone series, or Rot-Rottodt-liegende, which presents 

 a thickness of 913 feet, and the calcareous conglomerates and breccias of the Stack 

 series, 455 feet thick, representing the magnesian limestone of the Perraians. 

 These rocks are faidted into the Ordovician slates, and neither their true base nor 

 their upper boundary is visible. The pebbles of Carboniferous Limestone in the 

 conglomerates point to a post-Carboniferous age, and the physical characters of 

 both divisions are identical with those of the Permian rocks of the North of 

 England, and more particularly with those of the Lake District, of the Vale of 

 Eden and Barrow Mouth, described by Sedgwick, Ilarkness, Binney, Eccles, and 

 Nicholson. It is clear that north-eastern Ireland, the northern part of the Isle of 

 Man, and the area of the Lake District, including the Vale of Eden, were parts of 

 the same Permian marine basin, in which, as it approached southern Lancashire, 

 the waters became more highly charged with mud, the calcareous element being 

 conspicuous in the one, and being replaced in the other by thick accumulations of 

 marl. 



2. The Carboniferous Limestone, Triassic Sandstone, and Salt-hearing Marls 

 of the North of the Isle of Man. By Professor Boyd Dawkins, F.R.S. 



The Ordovician slates, quartzites, and conglomerates, and the associated 

 volcanic rocks of the * massif of the island gradually pass underneath the sand, 

 shingle, and clay of the Boulder Clay series in going northward along the coast 



