22 JOHAN KIÆR. A NEW DOWNTONIAN FAUNA ETC. M.-N. Kl. 



to 11 i an) a ^c and ever y tli i n^ ^oes to prove that the upper 

 portion also boloney. s to this division of the Silurian age. 



The Sandstone series must in consequence be classified 

 as the youngest part of our Upper Silurian. 



The consequence is that my previous attempts at comparing our 

 Upper Silurian must be modified to some degree. It is however outside 

 the province of a preliminary report such as this to consider this question 

 thoroughly. It can however be stated that the uppermost marine zone 

 of Ludlow, 9 g, the zone with lA-perdiiin Norvcfika Kiær, can still be 

 regarded as of Downtonian age, but I now compare it with the oldest 

 part of this series and not with the youngest one as formerly. The 

 transition from marine to non-marine faciès thus took place in' the Kri- 

 stiania area some time after the beginning of the Downtonian period. 



Our Downtonian sediments therefore, ma)- either be classified as a 

 special stage, Downtonian, as is commonly done in Scotland, or be 

 regarded as the uppermost part of Ludlow. I consider the latter arran- 

 gement the better one. It then seems to be most natural for us to divide 

 our Ludlow into two substages : a lower part with marine facies (the 

 zones 9 a — g) and an upper one with terrestrial and lacustral facies (the 

 sandstone series). 



I intend to work out a division of the latter into zones later on, 

 when I have had an opportunity of studying the whole sandstone series 

 more closely. 



Printed 4 December 191 1. 



