1904-5.] Graptolite-bearing Rocks of the South Orkneys. 467 
In the only previous reference to the structure of these islands 
that I have been able to find, viz., the reports of M. Dumont 
D’Urville’s voyage,* their only landing seems to have been on a 
small islet about half a mile from Saddle Island, where they report 
greyish limestone and phyllitic shales, with a N.N.W. and S.S.E. 
strike, and inclined at over 60°. 
Although geographically situated nearer the South Shetlands 
and Graham Land, the strike of the rocks leads one to consider 
whether these islands are not more intimately connected with 
Alternative line. Position doubtful. 
No soundings. 
South America. In this connection it is important to consider 
some geological facts from areas further afield. In the Falkland 
Islands the Silurian or Devonian rocks there are folded along an 
east and west axis. South Georgia, composed entirely of clay 
slates, in which one fossil shell has been found — of Upper 
Palaeozoic or Lower Mesozoic Age, according to Professor Koken — 
is stated f by Dr Andersson, of the recent Swedish Antarctic 
* “ Voyage au Pole Sud, sous le commandement de M. Dumont D’Urville,” 
Geologic, par M. J. Grange, 
t Andersson, Geog. Jour., Oct. 1902. 
