110 SILUKIA. [Chap. VI. 
Section across the elevated Valley of WooLiiorE. (From Sil. Syst.) 
W.S.W. Haugh Wood. Devereux Park. Seager Hill. E.N.E. 
/ e 3 e 2 e 1 d 3 d 2 d 1 c d 1 d* d 3 e l e 2 e 3 J 
c. Upper Llandovery rock. d 1 . Woolhope or Lower Wenlock limestone and shale. 
d 2 . Wenlock shale, d 3 . Wenlock limestone. e l . Lower Ludlow, e 2 . Middle Ludlow, 
or Aymestry limestone, e 3 . Upper Ludlow. /. Old Bed Sandstone (base of). 
under the Wenlock shale, d 2 , with its chief limestone, d 3 ; whilst these 
again plunge under the Ludlow rocks, e, and Old Red Sandstone, /, as dis- 
played in this diagram. In short, the student has here before him, on 
either side of the central dome of Haugh Wood, a full exposition of all the 
Upper Silurian rocks from their base to their summit. 
The phenomena of this most remarkable elliptical mass (see Map), insu- 
lated and raised up through a great area of overlapping Old Eed Sandstone, 
were first described in the ' Silurian System,' and have since been given in 
still greater detail by Professor Phillips. The term ' valley of elevation ' 
does not convey an adequate idea of this wonderful geological scene ; for 
within the encircling ridge of Ludlow rocks, e 2 , there is one parallel sur- 
rounding valley in the Ludlow shale, e\ and another in the Wenlock 
shale, d 2 , or between the ridge of Wenlock limestone, d 3 , and the Woolhope 
limestone, d l . Thus, by the elevation of the various strata around a com- 
mon centre, and by the subsequent excavation of their softer members, the 
hill or dome of Haugh Wood has been left, by natural causes, as if it were 
a huge artificial intrenched camp with two encircling mounds and two 
circumfluent valleys. 
One of the most striking features for the consideration of the geologist 
is, that neither the central dome nor the surrounding ridges, including the 
outer encircling ring of Ludlow rocks, offer a trace of drifted matter or 
gravel, or even any remnants of the various strata which must, in the pro- 
cess of elevation, have been at first bent over in the form represented by the 
dotted lines, and afterwards demolished. All the debris resulting from the 
destruction of this once great solid mass has therefore been swept out, the 
tract being one of clean denudation. Another striking example of a similar 
phenomenon, and which clearly demonstrates the intensely powerful agency 
of former geological causes, is seen in the heart of the Ludlow promontory 
(p. 124). This phenomenon will be dwelt upon in the concluding chapter*. 
* The best mode of examining the Woolhope both the property of Lady Emily Foley, on the 
Valley tract is to enter it by Mordiford, through right ; and passing along the crest of Seager Hill, 
the only considerable opening by which the waters thence cross the valley by Woolhope to Fown- 
escape from the interior of the valley, and, mount- hope, and there rej oin the carriage-road. For de- 
ing to Backbury Camp, walk along the outer tails, see 'Silurian System,' with enlarged Map, 
ledge of Ludlow rocks, leave the magnificent Park &c, p. 427. 
of Stoke Edith on the left and Devereux Park, 
