May, 1938 The Queensland Naturalist 
93 
in geological literature) is quite distinct from the Bris- 
bane River Gravel, although they lie almost side by side. 
There are, it is true, some points of resemblance. For 
example, jaspers and quartzites occur in each, but the 
similarities are altogether outweighed by the differences. 
In the first place, the Lone Pine Gravel is much coarser, 
many boulders being from six inches to twelve inches in 
diameter, and some measuring as much as thirty inches 
through. But this is the least important of the differ- 
ences. Of far more moment are the facts that the two 
suites of pebbles are in general quite different, and that 
in particular, certain very striking and prominent types 
in the Brisbane gravel are missing from the Lone Pine 
deposit, and vice versa. Thus one of the most striking 
groups of pebbles in the Brisbane gravel are the porphy- 
ritic andesites mentioned in the earlier part of this 
address. These are common enough in the lower reaches, 
and as one follows the river up towards its source, they 
become more and more prominent until at the point 
where the Monsildale Creek enters the river, they are in 
an overwhelming preponderance. During a long and 
careful search 1 was unable to find one representative 
of these pebbles in the Lone Pine Gravel. 
On the other hand, the most arresting feature in the 
Lone Pine deposit is the presence of large boulders of 
quartzite rounded and polished and with curious embay- 
ments or dimples. The quartzite itself is of an unusual 
type, and is known to Queensland geologists by the 
homely name of 4 ‘Billy. ” Its occurrence in the curiously 
shaped boulders to which reference has just been made 
renders it doubly remarkable and equally conspicuous. 
These boulders are quite unrepresented in the gravels of 
the Brisbane River, although in addition to the Lone 
Pine occurrence, they have been found by Professor 
Skertchly in Sherwood (in what he whimsically termed 
The Higeldy Gravels), and by Dr. Marks at Eagle Farm. 
We may conclude from these facts, I think, that 
while the gravels of the Brisbane River, as exemplified 
by the pebbles of my garden path, are not truly repre- 
sentative of the area drained by the river, they neverthe- 
less form a distinctive assemblage that is unlikely to be 
duplicated in Queensland or indeed anywhere else in th§ 
world, 
