128 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Dec. 17, 



There are strong reasons for inferring that the presence of the 

 Skiddaw slates at Eggbeck is the result of an anticlinal axis crossing 

 this portion of the Lake-district and extending in a W.S.W. direc- 

 tion. Proofs of the existence of this axis can be seen in the neigh- 

 bourhood of Patterdale. On the east side of this portion of Ulls- 

 water several slate-quarries have been "wrought, at Blowick, along 

 the western base of Place-fell. 



These slates usually show very imperfect stratification, and the 

 cleavage commonly intersects the bedding. In some localities, how- 

 ever, the dips are apparent, being S.S.E., generally at an angle of 

 30°, which is also the prevailing dip of the Skiddaw slates at Egg- 

 beck. On examining the arrangements of the lines of lamination 

 among the slates here, they also are found to conform to the dij)S 

 of the strata. Among the more regularly stratified beds east of 

 Patterdale, there is often a rapid thinning-out of the strata. 



On the opposite side of the lake, in the face of the cliff looking 

 towards Ullswater, immediately north of Patterdale Hall, the strata, 

 which consist of a dark greenish-grey grit, spotted with red, so as 

 to have almost a porphyritic appearance, dip towards the N.N.W. 

 about 35°, an inclination directly opposed to that on the east side of 

 the lake. 



These features support the inference that the axis before referred 

 to extends through Place-fell, and, crossing the upper reach of 

 Ullswater, passes through Grisedale, from whence it runs in the 

 direction of the granite-area in the lower part of Eskdale, in West 

 Cumberland. 



To return to the section along the eastern margin of the Lake- 

 district. To the south of the porphyries and greenish-grey rocks 

 associated with them in the higher portion of Eggbeck, we have in 

 Heltondale a development of the greenish-grey grits with indistinct 

 dips, but apparently inclining S.S.E. These also occur further south 

 at Butterwick, where they are intersected by north and south joints ; 

 and here likewise the stratification is imperfect. Southward from 

 this, at Bampton, the greenish-grey rocks are also seen, being worked 

 here for building-purposes. 



In this locality, besides the ordinary greenish-grey rocks, there 

 occur others which contain angular fragments of a hard, grey rock, 

 not unlike some of the harder varieties of the Skiddaw slates, im- 

 bedded in a greenish -grey matrix. A similar rock is seen on the 

 road from Ullswater, leading over Kirkstone Pass, and is also worked 

 for a building-stone in Borrowdale. 



The rocks at Bampton dip N.JST.W. about 40°, and in the interval 

 between this and Butterwick a synclinal axis occurs. Southward 

 from Bampton, in the neighbourhood of Thornthwaite Hall, situated 

 on the stream which flows out of Haws-water, there is a large mass 

 of the greenish-grey rocks ; they continue southwards, forming the 

 ridge called Scaleborrow, that separates the Haws-water valley from 

 Swinedale. Here too the rocks are equally devoid of stratification, 

 but are much intersected by joints, which often assume so regular an 

 aspect as to look like bedding. 



