TIN DEPOSITS OF NEW SOUTH WALES. © 95 
This point is brought home to us whether we exar ire the 
flanking rocks of the Carboniferous series formed of the débris 
from these older beds which were tilted by the granite, or, on the 
other hand, study the New England District itself and find that 
the slates which yet remain are only outlying patches included 
in folds in the granites by which they have been partially protected 
from denudation. 
A section from Glen Creek to Butler’s Reef, in the Emmayville 
District, forms a good illustration of this— 
a. Granite. b. Slates. c. Lode. 
B. Butler’s Claim. D. Do leoath. 7. Taylor’s 
G. Granite belt in which Hammer & Drill and Dutchman’s claims 
are situated. 
and it will be seen that, in places, the granite now stands high 
above the level of the slates, which, indeed, are Sony held as basins 
or - apes troughs in the hollows in the 
n itself suggestive of the time at whieh the denudation 
of the Ea heard rocks commen ced, and may also assist us in 
tracing the per iod of the felspathic eruptions. 
The dykes of felspar and quartz porphyry traverse both the 
granites and slates, and in Bailey’s alluvial mine at Rose Valley, 
and, indeed, in ard localities as well, tufaceous beds, which may 
be either true beds or may have been derived from the 
decomposition of the dyke rocks alias £6 are found resting upon 
the tin-bearing gravels. These tufaceous beds correspond very 
closely, both in apperenee and characters, with those tufas which 
are interstratified wit e lignites of Mount Somers, New 
Zealand, and which eee the massive quartz porphyry (Liparite) 
eruption of that pla 
at little pada there is to be gathered would appear to 
point to the fact that the eruption of these quartz porphyries of 
New England only preceded the basaltic outburst by a short time, 
geologically speaking, and that these felspathic rocks are, in fact, 
the earliest acidic lavas of that period, which, while finding their 
way to the surface ee rents in the earth’s crust, were of two 
viscous a nature to flow to any distance from the centre of 
eruption, and in feel cases began and ended their history as 
dykes through the country. 
