172 0. Holtedahl — A Tillite-like Conglomerate. 



belong to the pre-Cambrian, while the latter are closely 

 attached to the Holmia shale of the Lower Cambrian. 

 The folding of the Jotnian sandstone, however, has not 

 been decided; indeed, over the Swedish frontier it is 

 sometimes almost without folding. On the other hand, 

 considerable crust movements did occur in Sparagmite 

 time. In fact, we appear to have here the final dying out 

 of the pre-Cambrian diastrophic movements, the more 

 local vertical movements following the regional and much 

 older tangential ones. In some ways it may be said that 

 the sparagmite s are of a time transitional between the 

 true Proterozoic and the Paleozoic, even if stratigraphi- 

 cally they are best classed with the Paleozoic. 



It is only natural that sediments like the sparagmites 

 should give rise' to divergent opinions as to their age 

 relations. In similar fashion, the well-known tillites of 

 China and Australia, which occur below fossiliferous 

 Cambrian, have been classified both as Cambrian and pre- 

 Cambrian. Such a struggle is often a struggle of words 

 only. The main thing is that we should have a sound 

 idea as to the relative stratigraphic position of these 

 ancient tillites and of their relation to the times of 

 orogeny. Their age relations will then in the course of 

 geologic endeavor be satisfactorily determined. That 

 the tillite-like conglomerate described in this paper is 

 of an age similar to that of the eastern tillites just 

 mentioned seems at any rate to be a rather probable 

 conclusion. 



Table of pre-Ordovician formations in the southern sparagmite 

 area of southern Norway. 



(Also compare with. Fig. 2.) 

 Paradoxides shale. Mid- Invasion of sea in south and west of 



die Cambrian. sparagmite area, 



Holmia shale. Lower Final pre-Ordovician denudation and 

 Cambrian. base-levelling of land south and west 



of sparagmite area. Invasion of sea 



into sparagmite region and further 



east. 



Quartz sandstone. Very strong denudation of land south- 



100 + m. west of sparagmite area ; thinning out 



of sandstones toward northeast. 

 Upper red and green Slow denudation and final peneplaria- 

 shale. Thin Eocam- tion of land east of area of red sparag- 

 brian. mite. 



