330 
PROCEEDINGS OF SECTION C. 
sea or lake now covering the submerged area, sub-glacial, streams, 
bearing in suspension the fine matter produced by the grinding of the 
ice-sheet over its rocky bed, discharged themselves, and deposited the 
matrix of the stratified mudstones ; while the bergs broken from the 
ice-front may, in the process of melting, have dropped into the beds 
then in course of formation the striated stones and other rocky material 
which they now contain. The appearance of the matrix when finely 
laminated, bending under and arching over the included stone, seems 
to strongly favour this hypothesis. The large erratics were, without 
doubt, transported to their present positions by the agency of icebergs. 
On the other hand, little direct evidence of the grounding of icebergs has 
been observed in this locality. The mudstones were deposited not far 
from land — in many cases in water of no great depth, and therefore 
within easy grounding distance of even moderately-sized bergs ; and 
the beds, being stratified, would plainly show in contortions and 
crumplings where the impact of the floating ice-mass had taken 
place, but, although many fine sections of the mudstones are exposed 
on the several creeks in the district, no such disruption of the strata 
has been noticed by us. 
Further examination may determine what affinity exists between 
the conglomerates and “till.” At present their stratification and the 
appearance of the subjacent mudstones raise difficulties, and until 
fuller information is obtained it seems unwise to put forward even a 
tentative theory of their method of formation. 
The third group of rocks of the series — the sandstones and free- 
stones — were deposited in fairly calm waters. Traces of false bedding 
may be seen, and the presence of included stones — which show a 
tendency to lie along the planes of stratification — point to the fact 
that the glacial conditions had not entirely passed away. The com- 
parative scarcity and, in general, small size of the included stones 
suggest that the severity of the glaciation had become somewhat 
modified, and the fossils discovered in the Bald Hill sandstones, which 
bear a great resemblance to the sandstones of the Coimadai district, 
strongly support this view. 
EXPLANATION OF PLATES 
I. Striated boulder from mudstone— Lerderderg River. 
II. “ Wightman’s Rock” — Coimadai. 
III. J unction of scored Silurian surface and conglomerate — Pyrete Creek. 
IV. Stratified beds overlying mudstone — Pyrete Creek. 
7. — ARTESIAN WATER IN THE WESTERN INTERIOR OF 
QUEENSLAND. 
By ROBERT L. JACK , F.G.S., F.R.G.S . 
For the last seven months two members of the Geological Survey 
staff were engaged on work bearing on the question of artesian water 
in Queensland. Mb. A.. Gibb Maitland was in the field for the whole 
of that time, and the writer for the greater part of the time, with some 
