SOME GEOLOGICAL NOTES UN COUNTRY BEHIND JERVIS BAY. 301 
the range (Currockbilly Range) appear to have been the 
same asat Sassafras. The rocks exposed between Ulladulla 
and Nelligen in a strip about 10 miles wide (where not 
capped by sand-dunes) are of Silurian or Ordovician age. To 
the west of this strip most of the rocks are Devonian. It 
is evident that the Sassafras tableland and the great dis- 
sected inclined plane between the Currockbilly Range and 
the sea constitute an uplifted plain of marine sediments, 
whose uplift has been slowly and gradually efiected in the 
long period intervening between the Permo-Carboniferous 
and the present. Sedimentation might have continued 
uninterruptedly into the Triassic or later Mesozoic periods, 
but all traces of such deposits have been removed by denu- 
dation. The whole area therefore forms a raised plain of 
marine accumulation and not a raised peneplain. 
Geology.—The geology of the Permo-Carboniferous rocks 
which cover a great part of this area has been accurately 
described by Jaquet, Harper, and Card;' excellent maps 
and sections accompany their paper. The writer has 
described the occurrence of copper in basalt and the 
remarkable quartz veins in the Nelligen district.” Dr. W.G. 
Woolnough and Mr. T. G. Taylor have contributed an 
important paper’ on the physiography and geology of the 
district lying immediately to the north of the one under 
discussion here. 
The Permo-Carboniferous rocks which form the surface 
formation between the Currockbilly Range and Jervis Bay 
belong to the Upper Marine Series. A thickness of between 
three and four thousand feet has been assigned to them by 
Jaquet. Ido not believe that they attain quite this thick- 
? Records Geol. Surv. N.S.W., 1905, Vol. vii1, pt. ii, pp. 67 - 94. 
? This Journal, June 3, 1908, p. 56. 
* “A striking example of River Capture in the Coastal District of New 
South Wales,” Proc. Linn, Soc. N.S.W., 1906, pt. iii. 
