THE HEART OF THE ANTARCTIC 



Hills before proceeding to the south side of the glacier 

 to look for fossils in the Beacon sandstone of the Knob 

 Head Mountain and the Terracotta Range. At the point 

 where the island (for the two islands indicated on the 

 Discovery map proved to be one) was struck, it proved 

 inaccessible, but was sufficiently close for a fairly accurate 

 description to be noted down and a rough plan and sketch 

 w^ere also taken. At the north-western end the sill of 

 dolerite still remained as a sheet of considerable thickness 

 capping the granite, and cutting across the granite were 

 two pipes of dolerite several feet thick which persisted until 

 they were lost beneath the ice. The middle of the island 

 is much lower than either end, and this causes the island, 

 when viewed from some distance, to have the appearance 

 of two smaller ones. The south-eastern end of the island 

 is a low granite hill with one shoulder capped by a thin 

 portion of the dolerite sill, the majority of which has been 

 removed by denudation. A specimen picked up proved 

 the dolerite to be a much finer-grained variety than that 

 of the Solitary Rocks. The plan will be published in the 

 geological volume of the results of the expedition, to- 

 gether with other sections illustrating different details. 



Subsequently we moved across to Knob Head Moun- 

 tain, and the rest of the time before it was necessary for 

 the party to return was occupied by an exhaustive ex- 

 amination of the rocks of that mountain and the Terra- 

 cotta Mountains, which, though they yielded no fossils, 

 produced many fine specimens in diff erent varieties of the 

 Beacon sandstones, and of junctions between the sand- 

 stone and the dolerite. Specimens of many other types 

 of rocks were obtained from the moraines at the foot of 

 the clifiTs. 



The cliffs at this spot are seamed with gullies, which 

 must be almost always swept by the strong winds which 

 blew practically continuously during the three or four days 



338 



