Mines and Mineral Statistics. 
135 
and it may be added that the above and other fossils of this age 
mentioned by me elsewhere, have been examined by palseonto- 
legists of eminence in Europe. Such are the genera Eavosites, 
Cjenites, Ptychophyllum, Calamapora, Syringopora, Emmonsia, 
Alveolites^ Cystophyllum, &c. These perhaps might not alone 
satisfy a doubt, but with them occurs Eeceptaculites. Since 1858, 
when these were determined, I have detected Halysites, which 
may settle the ciuestion as to Upper Silurian.” 
Specimens of Orthoccras, Encrinurus, Spirifera, Ch^etetes, Lcp- 
teua, Eeceptaculites Clarkii, Tentaculites, Halysites, Eavosites, 
&c., from Wellington, Molong, Queclong, and Mudgee, are 
exhibited, together with Eavosites, Gothlandica, Eavosites, Poly- 
morpha, Lithostrotion, Encrinital stems and Mollusks which I 
lately obtained from the limestone beds in the limestone reserve 
7 miles fromWallerawang. 
Igneous. 
The granites of Xew' South AEales present an almost endless 
variety both in structure and in composition. In our collection 
are specimens from the northern, western, and southern districts 
of the Colony, of the ordinary ternary and porphyritic granites, 
fined grained eurite and coarsely crystalline binary granite, show- 
ing a very varied arrangement of their component minerals, 
quartz, felspar, and mica, the crystals of which may be seen 
from minute grains up to several inches in size. The granites 
are of various ages, but none appear to be younger than Carbon- 
iferous, unless the intrusive greenstone which has disturbed the 
upper coal measures near Scone, may be here included. Many of 
these are intrusive, while others are doubtless metamorphic, 
and still retain the bedding-planes of the transmuted sedimentary 
rocks ; this latter feature is well shown in the banks of the creek 
near the towmship of Adelong. vSeveral of the igneous rocks — 
granites of at least two ages, greenstone, and basalts of jS'ew 
England, are described in my report on the tin mines (published 
herewith). Tlie Devonian strata of Mount Lambie have been 
upheaved and intruded by a porphyritic granite full of double 
hexagonal pyramids of quartz; it varies greatly in composition, 
and in places passes into a dense greenstone diorite. 
Gold is found in the alluvial drift derived from these Devonian 
granites ; and it is an interesting incident in the history of New 
South AVales, that in the granitic detritus near Hartley the Ecv. 
Mr. Clarke first found gold in Australia, in the year 1841. That 
the hornblendic granites have always been found to he more or 
less auriferous was many years ago pointed out by the same dis- 
tinguished geologist, whose valuable paper on the Progress of 
Gold Discovery in Aicstralia, enters very I’ully into the subject. 
