is of use to the man coming later if it is 
recorded and available. The most ela¬ 
borate survey is mere waste of time if 
unrecorded. Of all these observations 
a geological map is the greatest help to 
a succeeding observer, and the line in 
which a student's work will be most 
readily appreciated. 
This locality has been studied in detail 
in the past, and it was known that a 
member of the (Geological Survey had 
spent some considerable time on (Bruny 
recently. Further, with only four days 
for active work, it would be difficult to 
get beyond heading -L of my working 
syllabus above. Nevertheless, members 
of the club interested in geology had 
time to observe the general outline 
of the structure of the country. 
Adventure Bay is terminated at its 
southern extremity by the bold Fluted 
Cape. This headland received its name 
from the roughly columnar formation oil' 
the diabase that compose* it- a forma¬ 
tion exactly corresponding with the well- 
known diabase outcrops at the Organ 
Pipes, Mount Wellington. Cape Raoul, 
and at many spots throughout Southern 
Tasmania. Tills diabase belongs to the 
cretaceous system. lit presents the 
characteristic features of this rock, no¬ 
ticeably the four-sided colmimr weather, 
ing and deep indentations washed by 
the sea along joints. This rock stretches 
south past Cape Conella, along the coast 
as far as was visited, and underlies the 
soil of gullies and hills, as far west as 
Cook's Creek. The diabase also caps 
the considerable ridge that forms the 
backbone of South ©puny. 
Running along the coast from the 
neck south to about the jetty at Quiet 
Corner, then continuing inland in a sou¬ 
therly direction, approximately follow¬ 
ing' Cook's Creek, lies the other forma¬ 
tion of the locality, namely, the sand¬ 
stones and shales of the lower coal mea¬ 
sures. These beds run for some distance 
up the hills to the westward, and pro¬ 
bably continue under the capping diabaso 
They outcrop at a height of oOOft. above 
sea level, lmt whether this was due to 
faulting or represents the actual thick¬ 
ness of the beds the party had no time 
to discover. These beds are placed in the 
Permo-varboniferous system by Mr. (R. M. 
Johnston, who reports the discovery of 
typical marine shell fossils of this period. 
None of these fossils coftld be found by 
the party. These sandstones have been 
much eaten away by the sea. and form a 
series of more or less rugged points, se¬ 
parating small bays stretching from 
Quiet Corner to the neck. The soft 
sandstone wears away too evenly to form 
the more rugged sea features frequently 
found with the harder limestone© and 
diabase, ©ut there are some consider¬ 
able flirt's, and at least one “blowhole” 
of interest. The cliffs show many fine 
■ cations of cross bedding and iron mark¬ 
ings. and have frequently weathered into 
fantastic shapes. The material of tfie 
sandstone is usually gritty and much 
coarser than the beds of the (Knocklofty 
series. It resembles closely the promin¬ 
ent band of sandstone that runs through 
the limestone cliffs at. HJ&gleltawk Neeik. 
At the waterfall a creek has, in running 
over the lied of sandstone, cut a small 
forge about half a mile long and .10 yards 
wide, and with walls ranging from 50 
to 75 feet above the bed of the creek. 
This miniature canyon now ends in a 
sandstone cliff, over which the creek 
tails, and where it is still cutting back 
into the hills. About half-way between 
the Keck and Quiet Corner there occurs 
a bed of shale varying from 50 to 1(X) 
feet in thickness, containing the Adven¬ 
ture Bay coal measures. This stretches, 
for about half a mile along the coast, 
and then is lost owing to the dip of the 
strata. In the centre of these beds is 
the coal seam. It is about two feet 
wide, and of a fair quality. It was 
worked for about 20 years, ceasing 34 
years ago. Three horizontal tunnels 
were pushed in from the beach, one of 
which is still discernible. A further 
shaft was sunk about a quarter of a mile 
inland. The lied is badly broken by 
small faults, and the coal has the high 
proportion of ash only too common 
amongst the beds olf Southern Tasmania. 
In the shales immediately above and be¬ 
low tin- coal seam were found masses of 
fossil leaves and pieces of fossil wood. 
The species Qangamopteris and Glossop- 
teris were noticed, luit the layers are so 
full of impressions that it is impossible- 
23 
