11 



Then, finally, long after the last of the glaciers had dis- 

 appeared and the denuding forces of subsequent ages cut 

 deeply into the boulder clays which choked the valleys, 

 these moraine - filled hollows were doubly protected : 

 firstly, on account of their low - lying position, which 

 made them the last to come under the influence of 

 subaerial waste, and, secondly, from the existence 

 of the hard granitic ridge, on the up-stream side, which 

 ridge in the first instance led to the excavation of the hollows 

 in the softer rocks, and now stands guard over them in delay- 

 ing the processes of waste. Rosetta Head has played this 

 role, as pointed out, in the one case : and West Island, 

 although now severed from the mainland, has done a similar 

 thing in the history of King's Point moraine, as shown in 

 our second illustration. 



DESCRIPTION OF PLATES. 



Plate I. 



Map of the district described in the paper, showing the 

 morainic areas associated with Rosetta Head and King's Point. 



Plate II. 



Sketch-sections of the moraines at Rosetta Head and King's 

 Point. 



Plate III. 



Rosetta Head (the Bluff) and ridge of morainic material as 

 seen from Encounter Bay. Littoral reef of limestone is seen in 

 the foreground. 



Plate IV. 



Rosetta Head as seen from King's Point; also moraine and 

 -erratics overlying the cliffs of Cambrian schists which connect 

 the U\o headlands. 



Plate V. 



Rosetta Head moraine, with erratics, seen in transverse view, 

 near Encounter Bav. 



Plate VI. 



Group of granite erratics, in lineal order, near the base of 

 Glastonbury Hill, Inman Valley Road. 



Plate VII. 



Group of erratics in shallow water, Encounter Bay. The 

 boulders have been left by the retreat of cliffs of boulder-clay 

 worn away by the sea. 



Plate VIII. 



Great field of erratics, situated between high and low water 

 marks, washed from boulder-clay, Encounter Bay. 



