XCii PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May I906, 



affected by the great mass of Lower Palaeozoic rocks of the Howgill 

 and Kirkby-Lonsdale Fells and the Carboniferous highland to the 

 east of those Pells. We have here, so far as the country occupied 

 by Lower Palaeozoic rocks is concerned, a semi-dome bounded on the 

 east by the Dent Fault, and separated from the main dome by a 

 nearly-semicircular ring of Carboniferous Limestone which extends 

 in a curve from Kirkby Lonsdale to Kendal, where it becomes 

 broken ; but two outliers between Kendal and Tebay mark its course, 

 and at Tebay it again runs continuously in an easterly direction to 

 join the Dent Fault south-east of Kavenstonedale. 



This subsidiary dome affects the symmetry of the uplift, and also 

 the distribution of the low ground occupied by Triassic rocks, which 

 forms Edenside on the north-east of the district and Morecambe 

 Bay on the south-east ; for the occupation of, at any rate, a large 

 part of that bay by Triassic strata is shown by their occurrence on 

 the west side of the bay around Barrow-in-Furness, on the north 

 side near Cartmell, and on the east side near Hey sham. 



Before considering further the subsidiary dome we may turn to 

 the main dome, occupied largely by the Lower Palaeozoic rocks of 

 the Lake District proper ; and, in the first place, let us trace the line 

 of junction between the Lower Palaeozoic and the newer rocks 

 around the main dome. 



Beginning at the town of Cockermouth, on the north of the 

 district, this line extends in a general easterly direction to Carrock 

 Fell, and thence south-eastward to Tebay, where the break above 

 described is found ; but, taking the line in the direction of the 

 outliers, the trend is here south-westward past Kendal to Cartmell, 

 then westward through Ulverston to the north of Dalton-in-Furness, 

 across the estuary of the Duddon to Millom, thence north-north- 

 westward to Egremont, and finally north north-eastward to Cocker- 

 mouth. 



The line corresponds generally with the circle having a radius 

 of 15 miles, drawn by Dr. H. E. Mill from 



' what was possibly the crown of the ancient dome, and is now the middle of 

 the small central mountain-mass lying between the Thirlmere-Windermere and 

 the Langstrath-Borrowdale depressions.' x 



It must be remembered, however, that the circular line is not 



1 ' Bathymetrical Survey of the English Lakes Greogr. Journ. vol. vi (1895) 

 p. 48. 



