0. Eoltedahl — A Tillite-like Conglomerate. 171 



causing a peripheral denudation through the sparagmites 

 down to the granite and porphyry. With an especially 

 marked marginal uplift, glaciers and a laying down of 

 conglomerates without stratification may have come into 

 existence. It seems natural to assume that this uplift 

 represents not merely a gentle flexure, but a decided 

 faulting. 



When the deposition of the quartz sandstone began, the 

 land to the east of the red sparagmite was well base-lev- 

 elled, while toward the southwest there were still rising 

 heights. And as was shown in the paleogeography map 

 of Lower Cambrian time published by the writer in 1920 7 

 there was still land in this direction at the time of the 

 Holmia shale. 



That marginal upheavals or central sinkings have 

 repeatedly taken place in the area here considered, and 

 in the time of the sparagmites, preceding the deposition 

 of the oldest known fossiliferous sediments, is evident 

 from the general geologic occurrences. Such thick 

 accumulations of coarse materials, with their distinct 

 petrological characters, can only have been transported 

 over very short distances. That this upheaval has been 

 not a gentle warping but, rather, an important dislocation 

 of the crust is, in my opinion, further indicated by the 

 large bowlders found above the older sparagmite. A con- 

 glomerate like this one, following the deposition of spar- 

 agmitic sandstones and arenaceous shales, can scarcely 

 have been brought about alone through climatic changes ; 

 it must be due to a decided uplift of the adjacent land. 



Even though there must have been quite remarkable 

 vertical crust movements during Sparagmite time, we 

 know of no folding causing distinct unconformities. 

 On the other hand, a distinctly folded sedimentary series, 

 not far from the sparagmites, is found in the Trysil sand- 

 stone, which is the direct western continuation of the 

 Dala sandstone of the Swedish geologists and a repre- 

 sentative of the Jotnian formation of the pre-Cambrian 

 of Fennoscandia. The Trysil-Dala sandstones and the 

 Sparagmite have previously been generally considered to 

 belong to one great stratigraphic group, but to me this 

 appears to be a wrong correlation; the former clearly 



T 0. Holtedahl, this Journal (4), 49, 3. 



