Baden Powell — Igneous Rocks of Charnwood Forest. 1 ] 5 



Castle. From this point, continuing still in the same direction, a 

 boundary line is clearly marked, on the N.E. side of which the dip is 

 still, as before, towards the N.E. as far as to the neighbourhood of 

 Swithland Wood. But on the S.W. side of this line a different 

 arrangement occurs. Throughout a considerable space of a triangular 

 form, whose points are Bandon Castle, Hammercliff, and Greenhill, 

 the direction of the dip has not been ascertained, probably from the 

 few, if any, indications of rock, except those of igneous character, at 

 the top of the hills just named, all the lower district being covered 

 with the new red. 



Continuing towards the S.E., commencing from Greenhill, we 

 enter a district extending thence to Groby on one side, and to 

 Holgate on the other, within which a new direction of the dip prevails, 

 being, on an average, almost uniformly at the jS.E., or at right angles 

 to the former directions. This region includes the hills of Bencliff, 

 Old John, and others. On the outside of this region, both (as 

 already shown) to the N.E. and also to the S.W., the original op- 

 posing directions of the dip prevail, and extend, with few trifling 

 irregularities, to the boundaries of the slate district on either side. 



It would be important that the intermediate region just mentioned 

 should be more closely examined, to discover, if possible, precisely 

 where the change in the dip commences. 



Relation of the dip to Igneous Action. — This remarkable disposition 

 of the directions of the dip, and interruption of the regularity of the 

 axis of elevation, seem to bear a relation to the localities of igneous 

 action. 



Along the whole N.E. side of the Forest generally, there are few 

 or no indications of igneous, or porphyritic, rock, even among the 

 most remarkably elevated and dislocated slate rocks. As we ap- 

 proach the axis towards its northern part, such indications occur, 

 though sparingly ; but, when we come to the intermediate region, the 

 instances of igneous action become more frequent and remarkable, 

 especially within that region, and, in some degree, outside of it. 

 More precisely near the northern termination of the axis, in the 

 valley under the S.W. side of Buck-hill, and further on, nearly in the 

 same direction, at Long Cliff and New Cliff, developments of green- 

 stone occur, but they do not rise to any elevation above the surround- 

 ing district. 



In the same region, further to the S., in the valley under the S.W. 

 bore of Beacon-hill, it is stated, in Mr. Allsop's notice, that Prof. 

 Sedgwick detected a small manifestation of syenite ; but it is not 

 recognized in the Survey. I examined the locality described, 

 answering to which there are two pits : one close above the farm 

 called Alderman's Haw, which shows a close grained, dark grey 

 rock, presenting little of the ordinary appearance of syenite, and 

 more resembling porphyry ; at another point, a little higher and 

 more to the W., there is a larger mass of the altered slate rock. Of 

 this another instance is marked in the Survey, on the top of Block's- 

 hill, still more to the S. 



Black-hill. — In the same region of N.E. dip, but somewhat S. of 



