On Jurassic and Cretaceous fossils from Nortli-East Greenland. 449 



(licate a connection with the Englisli and Middle European Jurassic. 

 These last are, however, all more or less indiiï'erent Forms (species 

 of the genera Tancredia, Astarte , Chemnitzia), on whose occurrence 

 we can scarcely lay very much weight; to my inind they are unable 

 to prove the existence of a "Shetland Strait" at that time. If such 

 had existed, the Cephalopod fauna, for example, would also have 

 contained West and Middle European forms as well as the Russian- 

 Arctic. That hitherto unknown forms occur as well as earlier known 

 and described species, is not so surprising, as we are here dealing 

 with a region which is far removed from all the others, where deposits 

 of this time have been found. 



As mentioned, the Alternans-strata have been found at two 

 places, on Store Koldewey Island and on Hochstetter's Foreland. 

 Some samples of the sandstone from Store Koldewey contain pieces 

 of gneiss, which shows, that the Séquanian-Kimmeridgian Sea has 

 extended in over a gneiss region. A direct deposition of sandstone 

 on gneiss has been observed by Jarneh only in the middle sandstone 

 region, w^hich as already mentioned also belongs to the Alternans- 

 strata in all probability. The conditions on Hochstetter's Foreland 

 are not known with certaint}'. There is some reason to believe, 

 however, that the sandstone here also rests on gneiss, as the sand- 

 stone region — so far as known — borders directly on the gneiss 

 and we do not know of any dislocations between sandstone and 

 gneiss. 



The next stage represented in the material brought home by the 

 Danmark Expedition, is the Portlandian. This stage was only found, 

 however, as boulders in the surroundings of Danmarks Havn. These 

 boulders probably come from deposits, which are of the same age 

 as the sandstone at the Aucella River on Jameson's Land, which is 

 referred bj^ V. Madsen to Middle Portlandian. The discovery of 

 Aucella tennistriata in the boulders, however, indicates Lower Port- 

 landian, so that both the Lower and Middle Portlandian are possibly 

 represented. 



Along with these boulders, as already mentioned, 4 boulders of 

 quite a ditlerent character and fauna were found, namely, black cal- 

 careous concretions with a species of the genus Garnieria, which 

 shows that these belong to the Neocomian. These concretions 

 probabl}' come from deposits which were laid down in much deeper 

 w^ater than all the Jurassic sediments mentioned in the foregoing. 

 In this also they form a contrast to the other Neocomian deposits 

 known from North-East Greenland, namely, the "Aucella-conglome- 

 rate" Irom Aucellabjerget on the east coast of Store Koldewey Is- 

 land, which must be considered as a pure strand-formation. The 



