TRANSACTIONS OF SECTION C, 401 
to the surface of junction, for the simple reason that the granite has picked off, 
leaf by leaf, the layers of foliated rock against which it rose. The author thus 
ranges himself with those who ascribe the most profound metamorphism to 
igneous rather than to dynamic action, and ventures to suggest that similar 
conclusions may be drawn from the rocks of the Malmesbury series in Cape 
Colony, where a commingling of rocks appears to have taken place during a period 
of subterranean flow. It is noteworthy that the relations of schist and granite at 
Seapoint, near Cape Town, were admirably described with characteristic insight 
by Charles Darwin in 1844, The composite character of banded gneisses was 
realised by Michel Lévy and by Callaway simultaneously in 1887. 
WEDNESDAY, AUGUST 30. 
The following Report and Papers were read ;— 
1, Report on an Investigation of the Batoka Gorge and Adjacent Portions 
of the Zambesi Valley. By G. W, Lampiuen, FR... P.G'S.—See 
Reports, p. 292, 
2. Glacial Deposits of the Alps. By Professor A. PENcK. 
3. The Recent Work of the Transvaal Geological Survey. 
By Hervert Kynaston, B.A. 
The present communication gives a general account of the principal results of 
the work of the Geological Survey of the Transvaal since the commencement of 
its present organisation. The author points out that the initial stages of the work 
were much facilitated by the previous and admirable labours of Dr. G. A. F, 
Molengraaff, late State Geologist, Dr, Hatch, and other Transvaal geologists. 
The main divisions of the geological suecession, as represented in the Transvaal, 
are considered in ascending order, and a short account is given of how our know- 
ledge of each of these has been added to or modified by the work of the survey. 
With regard to the older rocks, z.c., those included within the South African 
Primary and Vaal River systems of Molengraaff, these have so far only just been 
touched upon by the survey, which has mainly confined its attention to the more 
central portions of the Transvaal, occupied by rocks belonging to the later systems, 
The Transvaal system comprises the black reef series, the dolomite, and the 
Pretoria series, and is the Transvaal equivalent of the Campbell Rand and Griqua 
Town series of Griqualand West and the Prieska district. 
The black reef series has been mapped between Pretoria and Johannesburg on the 
south, in the Lydenburg district on the east, and traversed in the Chunie mountains, 
south of Pietersburg, on the north, It rests immediately upon the old granite, or 
the up-tilted edges of the older sediments, with a very marked unconformity, and 
constitutes in the Lydenburg district the eastern edge of the High Veld Plateau, 
its most conspicuous feature culminating in the Devil's Kantor. The thickness 
south of Pretoria is insignificant, but the series attains a much greater develop- 
ment in the north, reaching a thickness of 1,600 feet in the Chunie mountains. 
A considerable area of the dolomite and Pretoria series, which succeed the 
black reef with perfect conformity, has now been mapped, mostly by Mr. A. L. 
Hall, in the Pretoria and Lydenburg districts, Mr. Hall’s detailed study of the 
1905. DD 
