.” “5 a i 
119 
being thrown into a vertical position, or slightly bent over, fell 
back against the yielding lava causing it to collapse into its 
present flattened shape, the old red sandstone which forms the 
matrix of the dyke meeting in places giving it the appearance of 
four separate dykes. The Vobster colliery workings, in the very 
heart of this movement, proves that the overlying Newbury seams 
were folded over where they now remain dipping south at a high 
angle. The intermediate Vobster coal strata being in the cleft, 
and being a very soft shale, fell together into the vacuum. The 
confusion thus caused was still further intensified by the move- 
ment we shall next consider, rendering the Vobster colliery 
- dangerous, expensive to work, and consequently abandoned. 
At present, the Newbury and Vobster workings, and the 
limestone at the quarry at Soho, are situated on the east side of 
the great fault. At the time of the eruption of the dyke, they 
composed a part of the fold over on the west side just described ; 
the subsequent action of the Radstock slide fault, was to transfer 
the strata in which those works are situated from the west to the 
east side of the fault where they are at present. This movement 
seems to have been at an early stage of the sinking of the down- 
throw side of the fault, as indicated by the relative depths of the 
bends of fold over on either side of the fault ; the difference of 
level amounts to 750 feet. 
We will now turn our attention to the fountain head of the 
water, and the conduit through which it flows to Bath. Having 
already noticed that the Clandown fault intersects the Mendip 
_vange near the eastern extremity of the dyke, and strikes 
northward into the centre of the basin at Clandown and Timsbury, 
we find that it also cuts through the south anticlinal as far as East 
Cranmore. Subsequent denudation has removed the limestone 
leaving the Old Red Sandstone exposed, and the line of the fault 
clearly marked by numerous swallow holes, and the severed edge of 
_ the undisturbed limestone on the east side. From the line of the 
fault to Cranmore tower, a distance of a mile, the ground rises 250 
