19 
ot' the older rock*. Cnlortunately must 
of the contacts are obscured by Vegeta¬ 
tion, or overlying soil, but those which 
are seen show that the rock is of filiei 
texture near the contact, while the sedi¬ 
mentary rocks show evident signs of 
meta-morphism. The sandstones and shales 
of pernio-carboniferous age becuine locally 
huidentd into quartzites and chert, coal 
is injured, and tuults are developed. Seve¬ 
ral fine sections showing these feature.} 
can be seen near Hobart, such us Auguata- 
road. Hnon-road, Btllei ive, and Sandford. 
One such example was seen at South- 
port not far from the ‘ 13tack of iiricks." 
The section exposed at the neighbouring 
cliffs shows a series of permo-carbon Her¬ 
ons mudstones ami shales horizontally 
bedded at the western end, and inclined 
and dipping about 20 degrees west further 
east. Here they can be seen to be lying 
on diabase, which continues to the chan¬ 
nel. The igueus rock is of fine texture 
at the contact, while the sediment a ties 
have been so locally hardened as to give 
rise to a small promontory. 
When such a laccolith is exposed by 
denudation the iguetis rock, being harder 
than the sedimentaries, is eroded more 
slowly. A mountain is formed often sur¬ 
rounded by a ring of sedimentaries. 
Mount Wellington is such an example. 
In other cases the locally-hardened sedi¬ 
mentaries may be left as a wall running 
round the central core- 1 am informed 
that Adamson's Peak and Mount I-a 
Perouse are examples, 'but cannot speak 
from personal knowledge. 
Near the George Til. monument some 
specimens were obtained of a rather de¬ 
composed portion of the diabase, but in¬ 
teresting as plainly showing twinned crys¬ 
tals of felspar. The rock is Here of 
slightly coarser grain than is usual. 
Tii cooling tliis rock cracks, and fre- 
uuently assumes a columnar structure. 
The Organ Pipes on Mount Wellington 
are an example. These cracks afford pas¬ 
sage for waters, which decompose the con¬ 
stituent minerals of the rock, and re- 
deposit various substances in these 
clacks, such as magnesium and calcium 
carbonate®, limon.t?, and hydrous sili¬ 
cates. 
7. After the diabase intrusion the coun¬ 
try suffered Horn a prolonged denudation, 
which is still proceeding. Oscillations oi 
land and sea followed, during which clay 
and leal beds have been formed. The beds 
seen at Sandy Bay are an example. At 
a later date basalt was poured out over 
a great part of the island. The rock 
exposed at the Alexandra Battery, near 
Hobart, belongs to this. Subsequent ele¬ 
vation ot the land surface has given Hsc 
to the deep gorges in the north and west, 
while still later depression has produced 
drowned valleys. Examples are the 
lamar in the North, and the Derwent 
and Huon in the South. The various 
hays in the south-east of the island would 
result from the same cause. A slight ele¬ 
vation has caused raised beaches. These 
are visible all along the North Coast, at 
Wineglass Hay in the east, and at South- 
port and Cox's Bight in the south. The 
tlal: land lying iwi Deep Hole and 
Southport Lagoon v * a familiar ex- 
ample to camp men , The. camp was 
establi shed on it. iat i of a very 
sarnie nature, and t ,v md has heaped 
it into sand dunes, whi h are slowly tra¬ 
velling seawards. The • advance is re¬ 
tarded by the bushes growing on the 
sand, but their shape is frequently typi¬ 
cal. The best example seen was near Hie 
George Ill. monument. 
8- At various points on the coast line 
shell piles are found, together with 
aboriginal worked flakes. The heaps are 
marked from natural ones, consisting 
invnrnp ;iy of edible varieties only. What 
may be an example was seen not far from 
the camp. 
deposit which may, perhaps, be 
worthy of mention m connection with the 
camp is the pile of slag at the pier. This 
ring IS neither natural imr Tasmanian, 
but apparently has been brought from 
booth Australia as ballast for ships. The 
heap also contains pieces of tertiary ba¬ 
salt. sandstone, and quartzite. 
Resources. 
While there is no reason why mineral 
deposits should not be found in the pie 
Devonian rocks (the quartz grits and 
limestone), no signs of mineral were seen, 
file lime-tone, however, is hard enough 
to be used as a building stone. A sam¬ 
ple of (be massive rock from the caves 
tool a high polish. Further, when the 
rock i> burnt it provides a very good 
lim. Tl.e lime which is produced from 
these beds at Gunn’s Plains and Beacons- 
field finds a ready sale. 
The coal which is mined in the Lower 
Mesozoic measures is of good quality, and 
rim dd prove of great importance. The 
water carriage is good, but harbour facili¬ 
ties are poor. It is to be hoped that the 
near J 'utarc will see this industry suc¬ 
cessful. 
The diabase is used in Launceston for 
road metal and as a (building stone. As 
it is a very tough rock, it is useful for 
works where dressed faces are not re¬ 
quired. 
The soil of the district is rather poor, 
hut may suffice for apple-growing. It is 
quite capable of producing splendid tim¬ 
ber. however, which deserves to be better 
looked utter than it is. It is noticeable 
that many of the trees and shrubs found 
on the West Coast occur here. 
