448 J- I 5 - J- Ravn. 



fragments. This is undoubted evidence of a transgression of the 

 Neocomian Sea. It is somewhat difficult to decide, on which deposits 

 this Sea at that place has exercised its destructive action. Perhaps 

 it has been both the gneiss and a Callovian sandstone, but it seems 

 to me more probable, that it has just been the gneiss-conglomerate, 

 which has been at that time exposed to erosion. Both the gneiss 

 and sandstone fragments may have come from this. And just the 

 fact, that the gneiss fragments in the Aucella-conglomerate reached 

 a larger size than in the gneiss conglomerate, seems to me to point 

 in favour of the same thing and in the gneiss conglomerate these 

 fragments were larger towards the south in the direction of the 

 Aucella conglomerate. 



2. Palaeogeographical remarks. 



Deposits belonging to the Callovian were only found at one 

 locality by the Danmark Expedition, namely on the east coast of 

 Store Koldewey Island down from "Trsekpasset". Unfortunately, only 

 a small number of fossils were found here. Of the 8 species which 

 could be determined, at least the half seem to be undescribed, and 

 not one of them is known from the deposits of the same age on 

 Jameson's Land. This is very remarkable, but it is doubtful if we 

 are entitled to draw conclusions from it with regard to the distribu- 

 tion of sea and land in these regions in the Callovian period. To 

 judge from the fauna, however, so much seems certain, that a con- 

 nection has existed at that time ("Shetland Strait", Neumayr) between 

 the "Arctic" Sea as it was then and the Sea which at that time 

 covered parts of West and Middle Europe. The existence of this 

 connection has already been suggested by other observers. 



Whilst the fauna in the North-East Greenland Callovian thus 

 clearly points towards the south, to West and Middle Europe, the 

 fauna in the Sequanian-Kimmeridgian seems just as distinctly to 

 point towards the east and south-east, to Spitzbergen, Nova Zembla 

 and the Russian Jurassic. The agreement with the fauna in the 

 Alternans-deposits of these countries is so great, that there can be 

 no doubt, that a wide sea has extended in the Sequanian-Kimmerid- 

 gian period from Central and North Russia up over Nova Zembla 

 and Spitzbergen to the coast of North-East Greenland. All the :\ 

 Aucella species found in the Alternans-deposits in North-East Green- 

 land (A. kirghisensis , A. Iironni and A. Sinzovi) have undoubtedly 

 come from the east and south-east and the same is the case with 

 all the Cephalopods (Cardioceras altemans and C. Nathorsti, as also 

 Belemnites Panderianus and B. breviaxis). A number of the other 

 species point also in the same direction , whilst others seem to in- 



