t) GEOLOGICAL OBSERVATIONS 339 



(3) 12 feet black shale. 



(2) 6 inches hard calcareous band. 



( 1 ) 6 feet black shale. 



B. At the Inland Forts — 



(13) 100 feet dolerite cap. 



white sandstone. 



sandstone with ferruginous concretions. 



yellow sandstone. 



sandstone with rod-like impressions. 



yellow sandstone with ferruginous concretions. 



white sandstone. 



yellow sandstone. 



marble-like sandstone. 



white sandstone. 



sandstone with stalagmites. 



almost white sandstone. 



variegated brown and yellow sandstone. 



The Dolerites. 



The dolerites appear to be confined to the mainland, where 

 they occur as very extensive sheets, which in the main cap the 

 Beacon Sandstone. The top of these sheets, which probably form 

 the highest summits of the Royal Society Range, has not been 

 attained, and therefore there is no direct evidence that surface 

 flows have not been produced. As indirect evidence we have the 

 fact that no scoriaceous rock of any description has been found in 

 any of the moraines, and therefore it is probable that no surface 

 flows occur in this district. 



It is convenient to commence at the highest point above sea 

 level, about 8,000 feet, from which doleritic rocks have been 

 obtained, and work down the great valley to the lowest point 

 where they occur, at a height of about 4,000 feet above sea 

 level. 



Mr. Armitage, on the first journey through the Royal Society 

 Range, returned with weathered specimens of dolerite from Depot 

 Nunatak, and at the same time Mr. Skelton photographed the 

 rock, which rises as a mass of great columns through the snow. 

 The rock is an outlier, and rears itself up to a height of 500 feet 

 above the snow, and the columns, which are continuous from top to 



z 2 



