ON THE CAMBRIAN ROCKS AT CURRAMULKA. 
By G. B. PritcHarp. 
(Communicated by Professor Tate.) 
[Read November 3, 1891. ] 
This paper is the outcome of a trip to Curramulka for the pur- 
pose of obtaining information with regard to the Cambrian rocks 
which were recently discovered at this locality. 
Curramulka is one of the hundreds on the eastern side of Yorke 
Peninsula, and the township of the same name lies about twelve 
miles to the north-west of Port Vincent, at about the lowest part 
of a basin-shaped hollow; and it is in and around this township 
that the formation in question occurs. 
This area is coloured, to indicate that the rocks belong to the 
metamorphic series of Silurian age, by Mr. H. Y. L. Brown, in 
his sketch map of geology of South Australia; but recently Mr. 
mew. Pletcher, B.Se: (Proc. Roy. Soc) 8_A., voli X1ih, part-I1., 
p. 249), proved that they were fossiliferous, and from the material 
he brought to light they were seen undoubtedly to belong to the 
Cambrian, thus adding another locality for fossils of this age. 
The whole of the country between Port Vincent and Curra- 
mulka to within a mile of the latter place is covered by several 
feet of travertine, the wells and tanks showing this deposit to be 
from about seven to ten feet in thickness. 
EOCENE. 
Deposits of Eocene age are met with at the coast, where they 
are exposed in, for the most part, low-lying cliffs along the 
western shores of St. Vincent’s Gulf, from near Black Point to 
Edithburgh to the south, a distance of about 32 miles, without a 
break. The rock in the neighbourhood of Port Vincent and 
Stansbury consists of a yellowish polyzoal limestone containing 
echinoderms, brachiopods, and a few lamellibranchs, and bears a 
strong resemblance, not only lithologically, but also in the charac- 
ter of its contents, to the polyzoal limestones at Aldinga; and at 
Waurn Ponds and the Moorabool Valley, in Victoria. How far 
the Eocene extends inland I cannot say, as in no place along the 
route I took was the travertine cover removed to expose the 
underlying rock. The following is a list of the species which 
have been obtained from this coast, and it will be readily seen that 
these beds belong to the same horizon as those just mentioned :— 
