§ 26. SLATE ROCKS OF SHROPSHIRE AND CUMBERLAND. 



799 



glomerate, or greywacke-slate. Mr. Bakewell observes, 

 that if the red colour were absent in the conglomerates of 

 the Old Red- sandstone, those beds would be in every 

 respect identical with the greywacke of these lower forma- 

 tions. 



1 



Lign. 183.— Sections of Slate rocks.* 



Fig. 1. Section near Llandovery. Quartzose grit and sandstone; a, a, lamina? of 

 deposit ; b, b, quartzose veins. The highly inclined lines mark the planes of 

 slaty cleavage. 



Fig. 2. Section of slate rocks at Whitesand bay, Pembrokeshire ; the cleavage 

 and lines of stratification divergent. 



26. Slate rocks of Shropshire and Cumberland. 

 — It would be irrelevant to our present purpose to 

 dwell on the mineralogical peculiarities and geographical 

 distribution of strata so widely distributed, and destitute 

 of a characteristic type of organic remains ; and I must 

 limit my remarks to a few British localities.! It will 



* Silurian System, p. 368, and p. 400. 



f From the interest attached to the islands of New Zealand, 

 in consequence of the peculiarity of their fauna and flora, I am 

 induced to add the following general view of their geological 

 structure in this place ; the grand physical features of the country 

 appearing to resemble our European districts of schistose strata with 

 intrusive volcanic rocks of ancient and modern date. — " New Zea- 

 land forms a group of mountainous islands nearly as large as England 

 and Wales ; its geological structure is rendered difficult of discovery 



