120 Baden Powell — Igneous Rocks of Charnwood Forest, 



the greatest elevation of them all, rising to 800 feet above the sea 

 in an isolated peak, covered entirely with dense wood, except a rocky 

 knoll, or ridge, at the top. These outbursts, which at a little distance 

 flank the S. and W. of the slate district, seem to be not improbably 

 connected with the similar developments at Mount Sorrel, to the N. 

 and E. Such a junction may, possibly, be indicated by a remarkable 

 ridge in the New Ked sandstone, which reaches, nearly in a straight 

 line, from Bradgate Park to Rotherby Plain, near Mount Sorrel; 

 along which, and in the valley below, blocks of Syenite constantly occur. 

 The yet more probable extension of a similar rock, in a continued 

 southerly direction, has been inferred by Mr. Jukes, from the occur- 

 rence of small manifestations of it in the New Eed, all lying nearly 

 in a line to a distance of about 15 miles or more, at Kirby, Muxloe, 

 Enderby, Marborough, Croft, Sapcote, and Potter's Marston. I only 

 add, that a further distance, of nearly the same extent, in the same 

 direction, brings us to Arbury-hill, near Daventry, at which place, 

 in the operations of the Trigonometrical Survey, Capt. Kater found 

 that remarkable deviation of the plumb-line of nearly 5^^ in extent, 

 which he attributes to an increase of gravitation at that locality, 

 owing to the presence of a dense rock below the surface, and remarks 

 its probable connexion with "Mount Sorrel and other primary 

 rocks" of this district. 



QOOBJUDON 



MARKEllEiJD 



CilOBi' 



Fig. 6. Diagram of the Igneous Rocks of Charnwood Forest. 

 Altered Rock. 



Igneous Rock 



Dykes. 



Average direction of dip. 



The line running from S.E. to N. W. indicates the direction of the great Anticlinal Axis. 



