262 Rev. James Yates on the Structure of the 



The quartz-rock occupies the middle part of the range from Hartshill to 

 the spot \vhere the road to Nuneaton crosses the Coventry canal. Its strata, 

 as well as those of the associated grauwacke, generally dip westward at an 

 angle varying from 40° to 70°. Their surfaces present the same waved and 

 swelling appearance, which characterizes the rock at Bromsgrove Lickey and 

 Powis Castle. I have not however discovered here any organic impressions. 

 Here are found veins of sulphate of barytes, exactly resembling that which 

 occurs in the trap-rocks of the Malvern Hills. In all other respects the quartz- 

 rock of this range agrees with that of Bromsgrove Lickey. Numerous quar- 

 ries are opened in it ; the rock, in consequence of its hardness and its disposi- 

 tion to break into small angular pieces, being used for making roads in all the 

 surrounding country. As it becomes at certain parts more ferruginous and 

 argillaceous, it passes into the ordinary appearance of the grauwacke as 

 already described. 



The last substance to be mentioned as entering into the composition of this 

 range is the greenstone, which throughout its course forms either beds in the 

 grauwacke conformable to its stratification, or dykes in the direction of its 

 cleavage. Of these the most remarkable are in Merevale Park. The house 

 formerly called Mere-cliff, and now the residence of D. S. Dugdale, Esq., 

 stands upon the northern extremity of a great dyke, which traverses the park, 

 and, rising in broken wooded eminences above the remains of the softer grau- 

 wacke, gives to this demesne its peculiar beauties. In one quarry within the 

 park, veins of calcareous spar and hematite pervade the trap ; in another it is 

 seen including fragments of the grauwacke. Beds of greenstone are seen 

 with the grauwacke, in which they lie, in quarries beside Merevale Church, 

 and in the Atherstone Outwoods ; in both of these situations the strata dip 

 westwards, at an angle of about 30° in the former instance, and 45° in the 

 latter. Omitting several intermediate localities and passing southwards, we 

 may notice a large mass of greenstone intersected by the Coventry canal, 

 rising upon the southern extremity of the hills of quartz-rock, and where it is 

 contiguous to the quartz-rock, including fragments of it. Another conside- 

 rable bed is seen at Chilvers Coton, having both above and below a soft unc- 

 tuous clay of a lively red colour mottled with light green. Still further south, a 

 large mass of greenstone breaks through the grauwacke at Griff Hollow, dis- 

 turbing its stratification and sending through it some minor branches. The 

 rock, of which these branches consist, is very hard and compact, breaking 

 with difficulty into remarkably sharp fragments, and devoid of any crystalline 

 structure. Its colour is greenish gray, and its fracture splintery. Some beds 

 of it are seen, as represented in PI. XXVII. fig. 3. in a perpendiculai- face 



