159 



brought home by the Nathorst Expedition. I shall return to 

 these rocks later. 



The extent of distribution of the various types is not 

 yet known. 



The fourth area consists of the tracts N. of Mackenzie Bay. 

 Here the primary rock everywhere approaches much closer to 

 the outer coast-line, the littoral zone having at the most only 

 a breadth of nearly 20 miles. Just as in the southernmost 

 area, it is composed chiefly of basalt with intervening "layers" 

 of partially fossiliferous tertiary rock; however, there are also 

 strata belonging to the Jurassic system, somewhat more recent 

 than those at Scoresby Sound. Beside the true basalt also acid 

 porphyritic surface-rocks occur at Cape Broer Ruys. 



The Danish Expedition has brought back new material of 

 general interest from only the two southerly of these areas, 

 although in the two others as well observations and collections 

 were made which amplify our previous knowledge and help to 

 give a picture of this part of the East Coast in its entirety. 



I will now pass on to a pétrographie description of the 

 rocks of the district, confining myself in the first place to the 

 crystalline types of rock and to some hitherto little known 

 non-fossiliferous or only slightly fossiliferous sedimentary for- 

 mations. A brief survey of the stratigraphy of the district will 

 also be included. I will then proceed to give an account of 

 the topography of the district and the witness it bears to the 

 history of its development. 



