14 Messrs. W. Phillips and Kent on [Jan. 



inclosing grains of quartz, takes the same course, and we may 

 add that on Old John Hill, in Grooby Park, and in other places, 

 some of the varieties of the slaty rocks obviously succeed each 

 other under the same circumstances. In Hind's new quarry 

 near Swithland, and in the quarry near Woodhouse Eaves, the 

 course of the best slates, which, in both cases, is about 12 feet 

 wide, is not parallel to the cleavage, but crosses it in both cases 

 at about the same angle, which, however, we did not ascertain. 



We have also mentioned that the rocks of particular parts of 

 this district are banded of various colours, dependant, as we 

 assume, on examination, upon the quantity of chlorite, which 

 we have no doubt is the colouring substance of these rocks 

 generally, whenever, as is mostly the case, the hue is green or 

 greenish. These differently coloured bands or layers are disposed 

 with the utmost regularity parallel to each other, and vary from 

 the 16th of an inch, or even less, to some inches in thickness, 

 and the slaty rocks thus disposed comprehend almost every 

 variety found in the district. This appearance is particularly 

 obvious on Morley Hill, in the northern part of the district, on 

 the hill called Hanging Rocks on the eastern, on Old John Hill, 

 on the south-eastern ; while on the western side, as for some dist- 

 ance on the north of Whitwick, the rocks possess this character 

 in a less degree, and there is more confusion apparent among 

 them from the operation of external causes having left large 

 blocks piled in the rudest manner on each other. 



Although these bands or layers are visible in the rocks of 

 several other hills besides those just mentioned, we select them 

 because, though there is a perfect uniformity on each hill, in 

 the dip and direction of the bands, each differs from the other in 

 these respects. On Morley Hill, the dip is 45° to the N ; on 

 the Hanging Rocks it is 45° to the E, and on Old John Hill 32° 

 to the S, but that of the rocks at the foot of it are 45°. It is 

 worthy of note, therefore, that as these several hills are situated 

 on the extremes or outer edges of the tract, the bands of each 

 dip away from the centre ; and if these regular layers be 

 taken as the order of deposit, and, therefore, as regular stratifi- 

 cation, they tend to show it to have taken place in the mantle- 

 shaped form. 



But in whatever direction these lavers may dip, it is remarka- 

 ble that the dip and direction of the more slaty parts of the rock 

 is invariably as above quoted, and it is impossible to exhibit a 

 more striking instance of this fact, than is manifest in a rock 

 situated in a field at the south-western foot of Old John Hill, 

 and immediately behind the last house in Newton Linford. 



