EUBIDGE — SOUTH-AFEICAN ROCKS. 
49 
from it. I believe his wide dislocation of the Ceres beds from the cLay- 
shite to be an error into which he has been led by a state of things 
like that of Ezel's Poort. I have never been able to get direct proof 
that this is the case here, although I have elsewhere, as shall pre- 
sently appear. 
On my return to the Eastern Province, I thought I saw evidence 
of the siliceous change of rocks on a much greater scale than I had 
observed them in Namaqualand. T wrote a Paper on the subject, 
and published it in the local magazine I have quoted above (* Eastern 
Province Magazine,' vol. ii. p. 187). I hoped it would have led my 
friends here, from whose sections mine differed considerably, to re- 
examine their data. A little after, I sent home a Paper which was 
read at the Geological Society of London (see an abstract of it in the 
'Geological Society's Journal,' vol. xv. p. 195), in which I explained 
these views, and predicted that the clay-slate of the west would here- 
after be found identical with the Upper Silurian of Bain, and the Car- 
boniferous rocks of the east identical with both, the quartzite being 
changed rock, sometimes slate itself, sometimes a newer unconfor- 
mable rock. Of this identity I was enabled to send home strong 
presumptive proof in the shape of fossils identical with the Upper 
Silurian of Bain, from the clay-slate on the western shores of Prancis 
Bay. More recently I have obtained the same fossils (pronounced 
Devonian at home) from various points between the Kromme and 
Kabeljouw rivers, St. Prancis Bay, in the clay-slate, and from Chatty, 
near Port Elizabeth ; from Naroo, near Uitenhage ; from Blauvv 
Krauts, on the Bezuidenhouts river, on the road to Graalf Eeinet > 
and from the northern base of the Coxcomb in the Winterhoek 
range in the Carboniferous. Still, it might be objected that there 
may really be a difference between the clay-slate and the Devonian, 
though j\rr. Bain may have mistaken the line of division. If refer- 
ence be made to the Admiralty chart of St. Francis Bay, it will be 
seen that the low shores of the bay are crossed by a range of moun- 
tains of considerable elevation. These mountains, which are quartz- 
ite, cross the strike at a considerable angle, nearly, in fact, for some 
distance at a right angle ; so that on the beach and the low hills you 
may cross near ten miles of slate, perhaps five miles of strike, while 
six or eight miles inland, on the heights, the corresponding part of 
the section is all quartzite. The quartzite must, consequently, cross 
unconformably the slates, and therefore be newer than they. The 
reasons why they cannot be older, I need not give here, as I have given 
many of them above. These same quartzite hills are continuous with 
others of the same lithological character, which are decidedly confor- 
mable with the Devonian rocks, though they too cross the strike at an 
angle of 30°. I have not had opportunities for such an examination 
of the country between this and Cape Town, as to enable me to say 
positively that there are no beds older than the Devonian ; but I 
think I have shown satisfactorily that the evidence on which the clay- 
slate is referred to a much higher antiquity is fallacious. I can safely 
assert that the Devonian beds of this country are crossed by lofty 
VOL. V. H 
