OF THE SOUTH DEVON COAST. 19 
series; but there is one case which appears to me so interesting 
and suggestive that I have reserved it for a separate notice. This 
is exhibited in the rocky headland upon whose northern slope 
the village of Torcross rests, and the most striking examples are 
exhibited in the smooth face of a low cliff rising from the shingly 
beach within a two minutes’ walk from the hotel door. The rock 
appears originally to have consisted of alternating layers of fine 
dark mud and silt. The former predominate; the latter, though 
differing so little in mineral composition or texture as to be with 
difficulty visible on a freshly broken surface, are more distinct on 
a weathered one, as their colour changes to a lighter grey than 
the former. The beds are much folded, and so are inclined at 
various angles to the direction of pressure. Where this has been 
normal to the bedding, the different layers have evidently been 
much compressed, the stripe is remarkably clear and sharply de- 
fined, cleavage corresponding with bedding; but in other parts, 
where the angle between the direction of pressure and the normal 
to the surface of the bed has been a fairly large one, the results 
are very remarkable. ‘The stripe is obscured or obliterated, and 
a new and often more conspicuous structure produced, which is 
parallel to the planes of cleavage. 
Fig. 9.—Diagrams of Pressure Structure in Banded Rock. 
1. Banded gritty (2, x’) and slaty (y, y') rock, cleavage parallel with x, x’. Gritty 
band about 4 inches thick. 
2. Enlarged drawing of part of gritty band between z 2’. 
3. Study of a portion of rock, about 14" by 1", where these gritty bands, which 
have lain diagonally, have been squeezed out by a nearly horizontal 
pressure. 
4, A small diagonal band of gritty rock squeezed out on one side only.’ 
C2 
