:,32 THE VOYAGE OF THE 'DISCOVERY 5 [An>x. 



examined in detail. In the main, all the structures observed in the 

 Admiralty Range are again seen, but are much more striking. 

 There are foothills of insignificant height, a north-and- south valley 

 separating the foothills from the main mountain mass, and a 

 mountain mass rising in a uniform cliff behind to a height of 

 10,000 feet, and with occasional peaks rising to 12,000 or 15,000 

 feet in altitude. From our Winter Quarters this range could 

 always be seen, though quite fifty miles away ; and even at this 

 great distance, so clear was the atmosphere, the plateau form was 

 always evident, and was rendered still more striking by the broad 

 band of lighter-coloured rock below, which extends from end to 

 end of the range. Thus the form of the range appears to be 

 determined by the horizontality of the rocks which compose it — 

 a fact abundantly proved by the sledge parties who traversed it. 



(5) The four ranges which determine the 300 miles of almost 

 straight coast to the south of latitude 79° S. appear to be exactly 

 similar to those already considered, and may be dismissed with 

 the mention of the plateau character which is strikingly shown and 

 beautifully illustrated by sketches made by Dr. Wilson during 

 Captain Scott's great journey to the south, when latitude 82 17' S. 

 was reached, and are all the more valuable in that they were 

 made by an unprejudiced observer. At the same time, Mr. 

 E. H. Shackleton obtained some valuable photographs, and the 

 next year Mr. Barne repoited a horizontal structure in the land at 

 about 8o° S. Mr. Mulock has carefully surveyed the land in this 

 high latitude, and the great plateaux separated by the deep, steep- 

 sided channels or inlets are being carefully charted, and this will 

 form a valuable addition to the geology of the area. 



The Rocks Obtained in South Victoria Land. 



The rocks obtained by the expedition fall naturally into five 

 quite distinct groups. Briefly they may be classed as gneisses, 

 granites, sandstones, dolerites, and recent volcanics, but little is 

 known of the field relations of these types, except the order in 

 which they occur. The important deposit of sandstone provides 

 a convenient stratigraphical datum line with reference to which 

 the other phenomena may be considered, and the above order 

 may be taken as chronological. 



