So TBOCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 1894, 



correlation. Prof. Lapworth, as might have heen expected, strongly 

 endorsed the views expressed by the Authors. He looked forward 

 to the day when the existence of these Graptolite-zones in the 

 Lower Palaeozoic rocks would be generally acknowledged, and that 

 they would be employed a? a basis for classification and mapping. 

 He further remarked that the thin Moffat series of the South of 

 Scotland represented the whole of the Llandeilo, Bala, and Llan- 

 dovery formations in other regions. Although ihe general position 

 of the Stockdale Shales with reference to other formations above 

 and below was known previously, the Authors had now fixed their 

 horizon from internal evidence. The zones they had detailed in the 

 Lake District agreed with zones already established in the South of 

 Scotland, Wales, and other countries. He commented on the small 

 thickness of these Stockdale beds, but pointed out that they were 

 represented by very great thicknesses of deposit elsewhere. Thus 

 the Browgill or Upper Stockdale series had their equivalent in 

 thousands of feet in the Gala group and the Tarannon ; whilst the 

 Skelgill, or Lower series, were represented by enormous thicknesses 

 in Girvan and Central Wales. He considered that the Authors had 

 accomplished a piece of work of the highest systematic importance, 

 but further zone-work was required, and he predicted that it would 

 be followed by a re-mapping of many areas. 



The same Authors have made a further contribution to our know- 

 ledge of the Older Palaeozoics in their paper on the Cross Fell Inlier, 

 which is one of the stratigraphical features of the Eden Valley — 

 representing a tract of Ordovician and Silurian rocks lying between 

 the Carboniferous of the Cross Fell range, on the east, and the New 

 lied Sandstone of the valley, on the west. This tract is about 

 16 miles in length, with an average breadth of rather over a mile; 

 and it is divided along its entire length by a fault, which separates 

 the Skiddaw Slates from the higher beds composing the Inlier on 

 the west. The district is very interesting to those who are desirous 

 of tracing the character and relations of the Lake District rocks in 

 their easterly development, after their eclipse by newer formations 

 in the central portion of the Eden Valley. But the main object of 

 the Authors has been to fix the ages of the various formations of 

 the Lower Palaeozoic rocks in the Inlier, to determine their organic 

 contents, and to compare them with the corresponding rocks of 

 other areas. Even the Skiddaw rocks are not treated in any detail ; 

 and, although there are petrographical notices of certain sedimentary 

 and volcanic rocks in that series, and also of the volcanic rocks of 



