154 



tion, and the study of which proved specially interesting owing 

 to the important contribution our expedition succeeded in making 

 to the question of the age of the whole group of the North- 

 Atlantic Basalts. 



Not less interesting is the study of East-Greenland's sedi- 

 mentary fossiliferous beds, of which a comprehensive material 

 was collected during the expedition. In this work I received 

 most valuable assistance from mag. sc. N. Hartz, the leader 

 of the expedition at that time. In the main each has devoted 

 himself in the same degree to the work, but the collecting of 

 fossils from the Rhaetic and Jurassic deposits in the SE. part 

 of Jameson Land has been carried out by Hartz alone. The 

 collections brought back have already been described in part, 

 viz. the marine Jurassic Fossils by V. Madsen^), Sauria by E. 

 Fraas^) and tertiary marine fossils by J. P. J. Ravn^), while 

 the triassie fossils will later on be described by K. Gr on vail, 

 and the plant fossils that were brought home by Hartz himself. 



I shall touch on various points bearing on the results of 

 these investigations in the following pages. 



Besides these questions, special attention was devoted 

 during the expedition to another point, which, especially in 

 Polar regions, should be of great interest, viz., the morpho- 

 logical study of these regions from a dynamico-geological point 

 of view, the characterising of their varied, often peculiar, sur- 

 face features, and the study of the forces that have produced 

 them, some of which operate here with an intensity that finds 

 no parallel elsewhere. In these respects the district under 

 consideration is of remarkable interest by reason of the ex- 

 ceptional variations it offers, and by reason of its great free- 

 dom from ice, despite its proximity to the mighty sheet of 

 land-ice. 



Meddelelser om Grønland XXIX: t57. 

 Meddelelser om Grønland XXIX: 277. 

 Meddelelser om Grønland XXIX: 93. 



