Ee ae 
Ppt sci gH i 
340 W. B. Clarke on the Sedimentary 
existence there of Silurian rocks identical with those of Victo- 
researches have increased the expectation of valuable deposits 
there, in addition to those which have already been opened on 
the Burnet, Crocodile Creek, Mount Wyatt, the Burdekin, 
al and. Star Creek ; about Peak Downs, and in other 
The Gold Field of Fingal in Tasmania is also partly occupied 
by rocks of Silurian age, the lithological structure s —— is 
identical with rocks in New South Wales and Vict 
Copper is abundant in strata which may be coferted: to the 
same epoch ; but a peculiarity which I have observed in most 
of the copper localities is, that the ores do not occur in lodes 
of the usual character , but sometimes, as on Peak Downs in 
Queensland, they follow the planes of the strata, and generally 
in New South Wa ales assume a dome-like form, rising in bosses 
at intervals wi surfa The Burra 
Burra Cop ne _ — Australia has also something of 
5 pet n my possession Pentamerus from 
oe in which the shell are embedded in copper ore. 
Wrivck Peixoeie Rocks. 
Mr. Jukes has shown cause why the term Devonian should 
be eliminated, referring the ie oathed beds to the bottom of the 
Carboniferous formation, 
It is probable that such will have to be the fate of certain 
strata in Australia, the fossils of which have at once a Silurian 
and a Carboniferous as aspect ; being connected with the former 
by certain corals, and with the latte r by the occurrence of 
— Nigillaria, and aes Lower Carboniferous 
lants. 
There is undoubtedly a regular passage downward from the 
marine fossils of the acknowledged Lower Carboniferous beds 
of New South Wales, to others which very much resemble the 
bob of: & land ; and a series of shells, 
‘&e., from the Murrumbidgee, which I submitted some 
gC to Messrs. Sal ter & Lonsdale, through Sir BR. I. Mur- 
* excited doubts as to their belonging to any but 
a pare Among these were Pha- 
nerotin, I Loxonema, A reticularis, Orthis 1 resupinata, 
vgianccecaic 3d ed. p. 296. 
