278 ' REPORTS OP COMMITTEES. 



3. If, as now seems probable, the glaciations of Wynyard, Bacclius 

 Marsh, and Hallett's Cove were synchronous there is now evidence of a 

 radiation of the ice, the angle enclosed between the striae of Wynard 

 and those of Hallett's Cove being from 30° up to 40°. 



4. The intercalation of bands of sandstone, conglomerate, and 

 . ripple-marked flagstones and mudstones amongst beds of true till 



perhaps indicates either contemporary recession of the ice sheets or 

 definite interglacial epochs. 



5. The fact that the most angular boulders in the till are formed 

 of black claystones and clayslates, often containing Grraptolites, and that 

 there is a large amount of similar but finer material in the matrix of 

 the till, and that this particular rock closely resembles that seen out- 

 cropping in the immediate neighborhood, leads to the conclusion that 

 here, as at Bacchus Marsh and at Hallett's Cove, the till, as regards 

 its matrix, at all events, is chiefly of local origin, and was formed by the 

 action of land ice in the form of a piedmont, or of an ice-sheet. 



6. The proximity of the top of the glacial beds of Wynyard to the 

 marine strata of Ihe Permo- Carboniferous shows that even near the 

 latitude of Wynyard the ice probably came down very close to — if not 

 actually to — sea-level. 



Under existing meterorological and geographical conditions it 

 would probably need a reduction of temperature of about 10° C. in 

 order to admit of glacier ice coming down to sea-level in this region. 



In conclusion the author would emphasize the need for further 

 research in this district on the following points : — 



1. As to the existence inland of striated rock pavements. 



2. As to the exact thickness of strata intervening between the 



topmost of the glacial beds at Wynyard and the lowest 

 of the overlying marine strata. 



Another feature of special interest in the Wynyard glacial beds, 

 and one which the author has not hitherto observed anywhere else, 

 is the occurrence at the point shown on the plan of a large mass of 

 laminated sandstone in the apparent form of an erratic in the glacial 

 beds. The mass measures 27ft. in length, 6ft. in width, and the part 

 protruding from the denuded surface of the glacial beds about 5ft. 

 in height, while there is evidently a considerable portion of the mass 

 still buried from view. The locality is about 10 chains to the south- 

 east of the entrance to the Wynyard River. 



At first sight the mass presented the appearance of a true erratic. 

 It is a very fine-grained sandstone, showing thinly-bedded structure, 

 together with very minute cross-bedding or current-bedding. The 

 bed planes of the mass are now almost vertical, but their upper portions 

 are slightly bent over from the W.S.W. towards the E.N.E. At the 

 south-west side of the mass are some contemporaneous gravel beds 

 in the mudstones, which are now nearly vertical as regards their bedding 

 planes. The mudstone of the till in which the mass is embedded dips 

 in a general westerly direction on the east side of the mass at an angle 

 of about 30°. 



