24 



J. CLIFTON WARD ON THE GRANITIC, GRANITOID, AND 



sthenite of White Crags. The figures 6 and 7 in Plate II. are from 

 slices of these samples. 





F. 



Carrock- 



Fell 

 summit. 



G. 



White 

 Crags. 



H. 



Contemp. 

 trap. 



Silica 



69-044 

 11-660 

 1-456 

 •540 

 3-570 

 9-673 

 1-449 

 2-030 



trace 

 trace 

 •137 

 •441 



56-656 

 16-129 

 7-068 

 2-306 

 1-293 

 8-296 

 6-590 

 •549 



' -153 



trace 

 •356 

 •604 



59-511 



17-460 



5-376 



1-801 



3-705 



3-093 



4-926 



1-271 



•604 



•115 



1-569 



•086 



•483 



Alumina 



Lime 



Magnesia 



Potash 



Soda 



Ferrous oxide 



Ferric oxide . 



Bisulphide of iron .... 



Phosphoric acid 



Carbonic acid 



Sulphur 



Loss on ignition 





100-000 



100-000 



100-000 



In the third column I have placed an analysis, H, of one of the 

 contemporaneous traps of the district, to contrast with G. 



When I first entered upon the examination of the Carrock district 

 I fully expected to find a group of unmistakably intrusive rocks ; 

 but, as already detailed, I soon found evidence, in the strike of the 

 various rocks above described, in the appearance of apparent dips, 

 and in the existence of included portions of contemporaneous trap, 

 to lead me to suspect that here also might be a case of the extreme 

 metamorphism of rocks in situ. When we come to consider what 

 the rocks may be which have possibly been thus altered, we find 

 that the bands of felsite, diorite(?), and hypersthenite occupy a 

 tract of country at the junction of the Skicldaw- slate series with the 

 volcanic scries. The volcanic rocks immediately eastwards, upon 

 the other side of the valley, consist of a thick series of lavas, very, 

 similar to those of Eycott Hill to the south-east. The country to 

 the north is formed of both ash and lava, the former much altered, 

 and exceedingly weathered, and containing some bands of Skiddaw 

 Slate about Dry Gill, dipping southward, as if under the rocks of 

 Carrock. Hence these rocks, if they really represent any beds of 

 the volcanic series, may occupy the place of the lowest series of 

 traps and ashes, originally lying in a synclinal, and being the equi- 

 valents of the series immediately north and north-west, and east 

 and south-east. Afterwards, on looking over the literature of the 

 area in question, I found that Prof. Sedgwick had written thus of 

 the hypersthenic rock : — " When on the spot, I considered at only 

 as an instance of one of the porphyries near the base of the middle 



