442 J. P. J. Ravn. 



representatives of the genera Cosinoceras and Kepplerites are found 

 here for the lirst time in Arctic regions in Jurassic deposits; these 

 give the fauna quite a characteristic appearance, recalhng that of the 

 West and Middle European Dogger. The genus Qiienstedtoceras he- 

 longs on the other hand to the most typical of the Russian Callovian; 

 yet its presence in the North-East Greenland Jurassic is not by any 

 means certain, as the only specimen available is too imperfect to 

 make a determination of the genus quite safe. 



1). Séquanian=Kimmeridgian. 



Deposits belonging to this series have not hitherto been discovered 

 in Greenland. It is certain, as we shall see later, that the sandstone 

 deposits found by the 2nd German North Pole Expedition on Hoch- 

 stetter's Foreland must be referred to these layers, but as mentioned 

 above a great error was made in determining the age of these 

 deposits owing to imperfect material, as they were believed to belong 

 to the Tertiary system. This mistake is excusable, as the fossils 

 (almost exclusively casts of Bivalves) are very badly preserved, so 

 that it is only in the fewest cases that the genus can be determined. 

 The Danmark Expedition, however, succeeded in finding Ammonites 

 in these deposits and, fortunately. Ammonites which are so charac- 

 teristic that they can be determined with complete certainty. Deposits 

 of the same age with a much better preserved fauna were also foimd 

 by the Danmark Expedition at different parts of Store Koldewey, on 

 which the two northernmost sandstone regions seem to belong to 

 the Séquanian-Kimmeridgian. The dilïerent localities where deposits 

 of this age have been found, may be quite briefly mentioned. 



1. "Kløft I". This locality lies near the north end of the 

 northern sandstone region on the east side of Store Koldewe}'. There 

 is here a narrow ravine with steep walls. The north side of the 

 гал1пе is covered by great masses of snow, which seem never to 

 melt, whereas the south side, at least in summer, is free of snow. 

 The wall of the ravine here is formed of sandstone layers, which lie 

 ap])roximately horizontal and are covered by moraine deposits. The 

 sandstone is gray in colour, calcareous and contains a good deal of 

 mica. It encloses the remains of a very rich fauna, unfortunately 

 too often in a bad state of preservation. As is shown by the fauna 

 list, 33 si)ecies are known from here, most of which however say 

 nothing definite with regard to the age of the deposits. This applies 

 especially to the numerous Lamellibranchs, which belong for the 

 most part to species of little characterized form and appearance. 

 Fortunately, however, we also find here 3 species of the genus 

 Aucella, namely A. kirghisensLs, A. Bronm and A. Sinzovi. The presence 



