PRECARBONIFEROUS ROCKS OF CnAENWOOD FOREST. 76 



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two exposures of slates. One is almost in contact with the syenite, 

 and shows well-marked bands with a dip S. 5° W. There is a 

 peculiar rippled structure on some of the joint-faces, probably a 

 result of pressure. The stripe of this, and, we believe, of the whole 

 south-western part of the forest between Bradgate and Bardon, 

 is shown by texture rather than by tint. The bands weather out ; 

 and the peculiar pink and white striping of Beacon and Nanpanton 

 is absent. The difference, however, may not be of any importance. 

 The other exposure is in a field a few yards oft, opposite the lane 

 leading to Ulverscroft. It also exhibits banded slates, greatly indu- 

 rated, some of the usual pale green colour and flinty texture, and 

 one thick bed, curiously like a felstone of rather compact texture, 

 greenish grey with dull green spots. Microscopic examination 

 shows it to be of clastic origin. 



Across the lane, at the spot called on the map Ulverscroft Mill (fig. 3), 

 is a long narrow ridge of rock, by the side of a brook, clothed with 

 trees. The uppermost beds of this are a gritty slate with narrow 

 and inconspicuous bands, which dip at angles of 50° or 55° in a 

 direction 10° W. of S. Below these are beds of breccia, containing 

 many fragments. The matrix is grit, with, as usual, a sprinkling of 

 quartz granules and crystals, dull greyish and coarse in the upper, with 

 a considerable number of quartz grains, finer and bluer and much 

 less quartzose in the lower. The larger fragments consist of a pinkish 

 slate highly altered, almost like a felstone, weathering to a dark red. 

 There are also a few very small fragments of a pale green slate, and 

 some of a darker green. 



Almost identical beds occur in the angle between the lanes to 

 Ulverscroft and Swithland — the same fine-banded grits above, with 

 the same breccias below ; while just above the grits is a fine slate 

 highly altered and indurated, and below the breccia fine grits with 

 such minute bands that eight or ten can be counted in the inch. 



Gritty, slightly banded slates are exposed east of the Ulverscroft 

 lane, about 300 yards from these. 



The strike of the above breccia-bed would, if it continued uniform, 

 carry it just above all the Old- John rocks of Bradgate. If, however, we 

 make allowance for the curving of the strike indicated by the change 

 from S. in Bradgate to S. 5° W. and S. 10° W. here, we should reach 

 some point on the south spur of Old John. The same effect might 

 be produced by a moderate fault. This Ulverscroft breccia-bed is 

 very different from the coarse breccia of Old John ; for its matrix is 

 much more homogeneous, and the fragments of pink slate in the 

 former are quite unlike those of pale green slate in the latter. 

 Nevertheless, as there are also fragments, though small, of the pale 

 green slate, and the two beds are so close, we are disposed to con- 

 sider it part of the same series, though we cannot at present pre- 

 cisely identify it with any one bed among those exposed in Bradgate 

 Park. 



Henceforward, till we reach Bardon Hill, exposures are few and 

 isolated. There is no approach to a continuous section throughout 

 the whole of this extensive district ; so that we must describe the 

 groups of rocks separately. 



