ANNALS 



or 



PHILOSOPHY. 



JANUARY, 1824. 



Article I. 



Observations on the Rocks of Mount Sorrel, of Charnwood Forest, 

 and of the Neighbourhood of Grooby, in Leicestershire. By 

 William Phillips, FLS. &c. and Samuel Luck Kent, MGS. 

 (With a Plate.) 



The tract to which the following observations are confined, 

 may, in general terms, be said to be comprehended within a 

 triangle, of which the angles are Mount Sorrel, Grooby, and 

 Thrinkston. (See the annexed Map*, Plate XXIV.) Two sides 

 of this triangle are about nine miles in length, namely, from 

 Mount Sorrel to Thrinkston, and from Thrinkston to Grooby; 

 the third side, namely, from Mount Sorrel to Grooby, is 

 between five and six miles long. This triangle comprehends 

 rocks remarkably differing from those of the vast plain of new 

 red sandstone which they overtop, though not to any considera- 

 ble elevation, the highest point of the whole being Bardon Hill, 

 situated nearly midway between Grooby and Thrinkston, and 

 which attains the height of 853 feet above the level of the sea. 

 On the south-west of this tract, however, rocks of the same 

 nature as those near Grooby, are, according to Mr. Greenough's 

 map, to be found for some little distance ; but the extent of 

 these we did not visit. 



The rocks of the. area we have mentioned vary greatly in their 

 external characters ; but before we proceed to describe them, it 



* The accompanying map is not given as an accurate representation of the lornis of 

 the hills, but chiefly to assist the reader, or the traveller, in forming some idea of their 

 relative position. 



Vew Series, vol. vn. b 



