Chap. IV.] 
THE CARADOC RANGrE. 
65 
great fault upon the W.N.W., and the protrusion of the igneous rocks of 
the ridge, the various overlying strata, which compose the great body of 
the Caradoc formation, are observed to succeed each other with perfect 
regularity. 
Proceeding from the eastern flank of the eruptive masses, and receding 
from the altered strata which adhere to the sides of the syenitic green- 
stone, felstone, and other rocks* forming the nucleus of the ridge, the 
fullest and clearest exhibitions of the overlying ' Shelly Sandstones' under 
review are to be seen in any transverse section which the explorer may 
examine as he proceeds towards the younger strata of the Wenlock Edge. 
The accompanying sketch, reduced from a coloured lithograph in the 
original work (Sil. Syst. p. 21 7), will explain better than pages of descrip- 
tion how these stratified deposits constitute the well-defined hills to the 
east of the igneous range. 
Caradoc. Lawley. Wrekin. Wenlock Edge &c. 
View from the East side op Caer Caradoc (Sil. Syst. p. 216). 
In the foreground is the steep flank of the Caer Caradoc (*), and beyond 
it to the left is the Lawley, or north-eastern end of the ridge: the 
Wrekin, another igneous outbreak through the Silurian strata, being on a 
different parallel, is seen in the central distance. The remainder of this 
view exhibits, even in the outline of the ground, a true indication of the 
succession of the various formations as first defined by myself in the years 
1832-3. 
The slopes marked 1, 1,1, constitute the chief masses of the Caradoc or 
Shelly Sandstone, exposed in a thickness of several thousand feet, and 
lying against the igneous and metamorphosed masses of the ridge (#). 
The thin zone to which the figure 2 is affixed is the band now termed 
Llandovery rock ; 3 stands for the Wenlock shale and limestone displayed 
in the Wenlock Edge ; whilst 4 represents a part of the distant overlying 
Ludlow rocks. The spectator has thus before him at one glance, an 
igneous and metamorphosed ridge, an important member of the Lower 
* The details of the mineral structure of the of hornstone, syenite, and greenstone ; globular 
eruptive rocks of the Caradoc range are given in concretions with actinolite are not unfrequent, 
the ' Silurian System.' The predominant rock is and coatings of quartz-rock or altered sandstone 
hard pinkish felspar or felstone, slightly porphy- are common (see Aikin, G-eol. Trans, i. p. 210; 
ritic, from which there are passages into varieties and Sil. Syst. p. 226). 
P 
