122 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 21, 



The north-west end of this section which passes through Nos. 2, 

 3 and 4 of the tabular section (see page 108), is intersected by three 

 or more porphyry dykes ; and at its south-east end it traverses the 

 Howgill range, and descends into the valley above Sedbergh through 

 the beds described in section 14. The whole country through which 

 these sections pass is extraordinarily faulted and contorted, and the 

 higher elevations, which are traversed by numerous porphyry dykes, 

 exceed two thousand feet. Among the valleys indenting Howgill 

 Fells is some wild and noble scenery, with two of the finest water- 

 falls in the north of England Thus it appears, that in the remark- 

 ably contorted chains east of the great Lune fault, we have No. 1,2, 

 3 and 4 of the tabular section in regular order, and that no higher 

 rocks appear in the chains, which at both ends are overlaid by the 

 conglomerates of the old red sandstone and by mountain limestone. 



January 21, 1846. 



Alfred Tyler, Esq., and Bland Hood Galland, Esq., were elected 

 Fellows of the Society. 



The reading of Professor Sedgwick's communication was resumed 

 and completed. 



Part II. 



The former part of my paper, containing numerous detailed sec- 

 tions, did not include the conclusions I wished to draw from them. 

 I there described the whole series of fossiliferous slates extending 

 from the Coniston limestone to the valley of the Lune, as subdivided 

 into five primary groups, viz. : — 



5. Upper Ludlow rocks, including tilestone, extending from 



Kendal to the banks of the Lune, near Kirkby Lonsdale. 

 4. Ireleth slates, divided into four sub-groups (a, /3, y, 3). 

 3. Hard gritty beds approaching a conglomerate form, with sub- 

 ordinate slaty masses, having numerous spherical concretions 

 arranged parallel to the beds. Fossils rare, but of Upper 

 Silurian species. 

 2. Coniston or Brathay jiagstone, having Upper Silurian fossils, 

 and developed to a thickness roughly estimated at 1500 feet. 

 The mineral structure almost identical with that of the flag- 

 stones of the Upper Silurian rocks of Sir'R. Murchison, and 

 yet more nearly resembling the Lower Denbigh flagstones 

 of North Wales. 

 1. Coniston limestone and calcareous slate having Lower Silurian 

 fossils. 



Respecting the upper part of the great formation of the Ireleth 

 slates (No. 4 ^) there is no difference of opinion, as it contains several 

 well-known Lower Ludlow fossils, and has already been compared, 



