On Jurassic and Cretaceous fossils from North-East Greenland. 44li 



of these 3 species alone shows, that we have here deposits which 

 must he of the same age as the Alternans-strata in the Russian 

 Jurassic and thus belong to the Sequanian - Kiinmeridgian. This 

 determination of the age is fully confirmed by the Cephalopods, 

 which are found together with the Aucellue. Thus, we very frequently 

 find Cardioceras alternans, the species which has given the Alternans- 

 strata their name. Of doubtful occurrence, on the other hand, is 

 C. Nathorsti, a species nearly related to C. alternans and described 

 from deposits on Spitzbergen, which according to Pompeckj' belong 

 to the Sequanian-Kimmeridgian. Belemnites have also been found 

 in "Kloft I", namely B. Panderianns and Ii. bretria.vis. Both point in 

 the same direction with regard to the age of the deposits, even though 

 both are also said to occur in layers which are somewhat older than 

 the Alternans-strata. 



2. "Kloft II". Close to the south of "Kloft I" lies a second 

 ravine of similar appearance and with quite similar sandstone. .Jak- 

 m:h did not succeed in following the separate beds from the one 

 ravine to the other; the layers show a tendency to thin out at the 

 end and thus cannot be followed for any long distance. The sand- 

 stone in "Kloft II" contained portions with a very light colour and 

 very glassy surfaces of fracture; the binding material between the 

 sand-grains is formed here of large anhedra of calcite. It is probably 

 some form of concretion. At this locality also a number of fossils, 

 some of which occurred in "Kloft I", were found; for example, 

 Aucella Bronni and A. Sinzoni. Further, we have Macrodon Keyser- 

 lingi from this locality, a species found in Europe in deposits that 

 extend in age from the Middle Calloviah to the Sequanian. Greater 

 weight must be ascribed, however, to the occurrence of Cardioceras 

 Nathorsti. It appears from the fauna, that the sandstone in "Kloft II" 

 is almost of the same age as that in "Kloft I". Yet the faunas are 

 somewhat different in the two ravines, as will be seen from the 

 fauna list. Thus, in "Kloft II" we have such characteristic forms as 

 Tancredia Jarneri and a large Pecten, which in the sequel is described 

 as P. cfr. validus. The sandstone in "Kloft II" is possibly a little 

 younger than in "Kloft I", though it still belongs to the Sequanian- 

 Kimmeridgian. 



15. "4. Saenkning". This locality lies much farther to the 

 south that the two mentioned above, but it still belongs to the 

 northernmost of the M sandstone regions on the east side of Store 

 Koldewey. The sandstone has here a similar appearance as at the 



1 See A. G. Nathohst : Eine vorlautige Mitteilung von Prof. J. F. Pompeckj fiber 

 die Altersfrage der Juraablagerungen Spitzbergens, p. 1503, Geol. Foren. i 



Stockholm Forliandl. Vol. X2. Stockholm 1910. 



