268 Miss C. A. Raisin—Greenstones & Schists of S. Devon. 
the rocks are said to be charged.1_ Mr. Somervail may, however, 
allude to some other specimens from these cliffs (since I did not 
attempt to make an exhaustive examination of the place). But, 
even if chlorite occurs, as it does, although not to a large extent, 
in the dyke further south, its presence is a rather slender argument 
for the identification of the schist and the diabase, since it is one 
of the commonest secondary products in basic igneous rocks of any 
age or locality. 
I examined the associated sedimentary rocks at Redlap, and they 
are genuine phyllites of the ordimary Devonian character, with only 
the usual crystalline development of minute films along the lamin- 
ation.” If the greenstones were the equivalents of the chlorite rock 
of the south, it would be strange, that these associated phyllites 
should present such wide and well-marked differences from the mica 
schists. They exhibit effects of pressure metamorphism, even more 
strongly than the phyllites just north of the fault, which bounds the 
crystalline series, and yet they are totally unlike the mica schists in 
that series. In one of the phyllites near Redlap, the laminz are 
puckered up into undulations, across which at places extends a suc- 
cession of small brown films. These appear to have formed from 
a ferruginous infiltration, inserting itself and accumulating between 
the laminze, along the steeper slope of the waves. Just at this part, 
rupture has often taken place, thus forming an incipient strain- 
slip cleavage, marked only by a darker staining. The steeper slope 
of the undulations is almost universally in the same relative position 
—doubtless on that side towards which the thrust of the rocks was 
directed. F 
I must thank Mr. Somervail, for calling my attention to the 
deserted quarry of chlorite schist to the north of the Hall Sands 
streamlet, in consequence of which the boundary-line must be marked 
at that part of the valley as north of the stream.’ It is to be 
regretted, however, that Mr. Somervail does not withdraw his former 
untenable assertion, but attempts to renew it, by confusing together 
the correct indication of the boundary given by Professor Bonney on 
the coast, and any slight modification which I have to make in the 
direction I traced inland. The position on the coast would not be 
affected by the occurrence of the chlorite schist south of the valley, 
nor by this chlorite schist north of the valley. The hypothesis of a 
straight east-to-west line for the fault is quite gratuitous, since no 
1 Trans. Devon Assoc. 1888, p. 224. 
® Thus these rocks in the direction of their micaceous constituent would agree with 
the phyllites described by Professor Bonney from near Morlaix, Q.J.G.S. 1888, 
vol. xliv. p. 13, and would differ from those near Torcross, Q.J.G.S. 1884, vol. xl. 
pe La 
3 See map Q.J.G.S. 1887, vol. xliii. p. 715. The dotted line marking the junction 
of phyllites and metamorphic rocks should probably cross the stream about east of 
the ¢ of Muckwell, before bending south-eastward or E.S.E. to the coast. This 
alteration does not, however, disprove the possibility that the fault may have 
determined the lower course of the valley, since there are no exposures which we can 
trust along the 400 yards between the quarry and the beach ; and also in a continued 
erosion along a fault, a portion of one rock may often be left adhering at some spot 
to the mass against which it was faulted. 
