SECTIONAL TRANSACTIONS.—C. 485 
On the new evidence it would appear that the greatest period of faulting, 
when faults of a throw of over 1,000 ft. took place, occurred during the latter 
part of the Pleistocene, long after man was in the country. 
The evidence is discussed and compared with similar evidence from the 
other parts of the Great Rift Valley, both north and south of East Africa. 
Dr. S. W. Wootpripce and Mr. J. F. Kirxatpy.—The longitudinal 
profiles of certain rivers in southern England, and their bearing on the 
eustatic theory (10.40). 
A comparison is instituted between the longitudinal profiles of the 
Kentish Stour, the Mole, the Rother (East Sussex), the Rother-Arun, the 
streams of the Hampshire basin and some of the East Anglian rivers. 
In all cases the curves are composite, indicating successive phases of 
rejuvenation with respect to successive marine base levels. For the area 
of the Weald and the Hampshire basin the close correspondence of rejuvena- 
tion features points to a general absence of differential warping during 
Pleistocene times—a conclusion also enforced by the attitude of the higher 
and older erosion surfaces. There seems thus to be good ground for 
supporting the application of the eustatic theory to the classification of the 
Pleistocene deposits of the area; though it has been very generally ignored 
by British workers on the wholly inadequate grounds that it does not apply 
to regions like Scandinavia, East Anglia, etc., whose physiographic history 
is, in fact, entirely different. 
The composite character of the curves is also used to invalidate the 
common assumption that terraces fall on a curve parallel to the present 
valley bottom. In many cases this is demonstrably not the case, and the 
consequences in the field of palzontological and archeological correlations 
are noteworthy. 
Mr. H. C. Cooke and Mr. W. A. JoHNstToN.—Possibilities of increasing 
the gold production of Canada (12.10). 
The Canadian Shield, from which 92 per cent. of Canada’s gold now 
comes, is likely to yield still larger amounts in the next few years. The 
three gold-producing provinces of Manitoba, Ontario and Quebec have all 
shown a rapid increase in annual production during the last seven years, and 
analysis of the causes of the change indicates that further important increases 
are to be expected, particularly in Ontario. 
Unless new discoveries are made in the near future, lode gold production 
from British Columbia will probably not increase notably in the next few 
years, and may even decrease somewhat with exhaustion of the Premier 
mine, the largest present producer. 
Placer gold production from Yukon may increase in the next few years 
if the number of dredges in use is increased. In British Columbia, hydrau- 
licking is the chief method of placer mining and will continue for many 
, years, but the annual output of gold from this method of mining may not 
much exceed the present output. More efficient methods of recovery of 
fine gold, for example by flotation, offers some prospect of success for dredg- 
ing of bar deposits on streams in British Columbia and Alberta. Extensive 
prospecting that is being carried on may result in the discovery of new fields. 
Report oF RESEARCH COMMITTEE on Critical Sections of Tertiary and 
Cretaceous rocks (12.30). 
