378 
Jukes on Australia. 
alteration. The coats were not more than a foot thick altogether, 
and peeled off as they decomposed, leaving the mass described 
above as a solid nucleus. 
These Wollongong sandstones contained a few fragments of 
fossil wood and shells and corals, identified by our Curator, Mr. 
Sowerby. 
Fossils of Wollongong. 
Stenopora crinita. 
Producta rugata. 
Spirifer subradiatus. 
- Stokesii. 
- avicula. 
Pacbydomus carinatus. 
Pacbydomus ovalis (P. globo- 
sus, Morris, not Sowerby). 
Ortkonota, sp. nov. 
Pleurotomaria Strzeleckiana. 
Bellerophon contractus, MSS. 
sp. nov. 
At Wollongong these beds dipped to the N. and N.N.W. at a 
slight angle, and in following them along the coast in that direc¬ 
tion, as we rose on to the higher beds and approached the coal, 
the sandstone became charged with great quantities of fossil wood. 
In the level sheets of rock left by the tide at low water, great 
fragments of black fossil wood, with smaller chips scattered about, 
were exposed in the lighter-colored sandstones, with their edges 
rounded and worn, and having been evidently drift-wood before 
they were enclosed in the rock. So like were they to common 
drift-wood on a beach, that I could hardly help fancying them so, 
until their hard siliceous substance and the difficulty of extracting 
them from the sandstones proved the contrary. The total 
thickness of these sandstones, as seen by us, was about 300 or 
400 feet. 
4 . The coal-measures that show themseves in the cliffs, on the 
north part of the Illawarra district, are but very insignificant, the 
total thickness of the whole beds containing the coal not exceeding 
200 feet. The actual thickness of the coal-seams themselves we 
did not ascertain, but from all we saw and heard of them, they 
must be but unimportant beds in an economical point of view. 
Abundance of black silicified wood strewed the road where it 
crossed these coal-measures, and I have no doubt whole trees 
might be extracted with comparatively little cost and trouble. 
3. Of the alternations of shales and sandstones above the coal, 
I can say nothing more, than that Mr. Clarke recognised them as 
