220 J. E. Marr—Some Effects of Pressure. 
The changes occurring in the case of the thin grit bands are 
generally similar to those described above; but here we find also 
that the particles are compressed, and there appears to have been a 
slight mineral rearrangement. The grits are nevertheless easily 
distinguishable as such even to the naked eye. 
The rocks at the bathing place are furthermore traversed by 
quartz veins, some of which were formed before the principal 
folding of the rocks, and in this case, the veins are affected in the 
same way as the thin bands of limestone. Fig. 2 shows the 
foldings of such a quartz vein, as seen close to the Tunnels at the 
Fie. 2. 
(CWC 
bathing place. Here two quartz veins occur parallel with two 
thin bands of limestone, and are folded like the limestone, showing 
that the veins were formed along the bedding planes, before the 
latter were affected by the folding. At this spot, both limestone and 
folded quartz veins suddenly disappear against a large divisional 
plane to the right, and a few feet to the right of this plane a series 
of quartz veins run parallel with the cleavage planes. It is possible 
that the latter veins were produced by the mechanical rearrangement 
of the folded veins along the thrust plane of a large fold, but it is 
not easy to prove this, as in the case of the limestones, and the 
rectilinear veins may have been formed in their present condition 
by segregation. Upon a flat surface of rock to the south of this 
place, quartz veins are seen formed into “eyes,” and these ‘eyes ” 
in places have been almost certainly dragged out. In such cases we 
have the incipient formation of a schistose rock composed of alter- 
nating lenticular masses of argillaceous material, limestone and 
quartz. . Precisely similar phenomena may be seen at Hagginton 
Beach and elsewhere, and indeed the whole coast offers excellent 
examples of the formation of these schistose structures in ordinary 
sediments, where all the mechanical peculiarities of a true schist are 
visible, without any great change in the chemical composition of the 
individual constituents of the rock. 
At Hagginton Beach a mass of limestone occurs, which has been 
pulled out so as to form a series of elliptical nodules occurring in 
the same line. Here we find the junction of limestone “eyes” 
without any folding of the particular mass of limestone in which 
the “eyes” occur. A flattening of these “eyes” would cause the 
formation of lenticular masses of limestone of a similar character to 
those described as occurring at the bathing place; nevertheless the 
mode of formation of the “eyes” is quite different in the two cases. 
Some of the smaller “eyes” seen in a cliff just north of Hagginton 
Beach are composed of masses of coral. The elliptical shape of the 
