Section C. 
GEOLOGY AND MINERALOGY, 
ADDRESS BY THE PRESIDENT, 
T. W. EDGEWORTH DAVID, B.A., E.G.S., 
Professor of Geology and Physical Geography , University of Sydney > 
jsr.s.w.' 
CONTENTS. 
I. Introductory. 
II. Notes on Recent Geological Work in 
Australia and Tasmania. 
III. Evidences of Glacial Action in Aus- 
tralia and Tasmania — 
1. Previous Observations. 
2. Recent Observations by the Author, 
3. Correlation of the Glacial Deposits. 
4. Antarctic Icebergs. 
5. Summary of Evidence. 
6. Conclusions. 
I.— INTRODUCTORY. 
A period of nearly thirty-six years has passed over Australian 
geologists since the time when Mr. (now Sir) Alfred E. C. Selwyn 
recorded his discovery of a glaciated rock surface in the valley of the 
Inman Eivcr, about seventy miles southerly from Adelaide ; nearly 
eighteen years have glided by since Professor Ealph Tate announced 
his important discovery of a beautifully glaciated rock pavement at 
Hallett’s Cove, fifteen miles southerly from the same city. The dis- 
covery of the former has been neglected or forgotten ; that of the latter 
was at the time received with incredulity. To-day, however, if any 
geologist were to question the glacial origin of the pavement at 
Hallett’s Cove, he would be looked upon by his fellows as a dangerous 
lunatic. Thus has the whirligig of time brought iu revenges to the 
old prophets. 
The development during the past five years in our knowledge of 
past ice action in Australia has progressed by leaps and bounds, and 
important as have been the evidences discovered by those who have 
studied the marks of Pliocene or Post-Pliocene glaciation in Australia 
and Tasmania, they are dwarfed when placed beside the gigantic relics 
of a far more ancient glaciation, the true nature of which has been 
fully recognised only within the very recent date above mentioned. 
Having lately seen some of the principal places in Australia where 
the Palaeozoic ice has been, I propose to tell you briefly what 1 saw. 
Before plunging, however, into this part of my subject, I will refer 
briefly to some of the labours of Australian geologists during the past 
year, then review the work done by others in the field of Australian 
glacial geology, and next refer to icebergs, and their direction of drift 
in the Southern Hemisphere. 
