On Jurassic and Cretaceous fossils from Xortli-East Greenland. 44;} 



of these 'Л species alone shows, thai we have here deposits which 

 must l)e of the same age as the Alternans-strata in the Russian 

 Jurassic and thus hehing to the Scquanian-Kimmeridgian. This 

 determination оГ the age is lully confirmed hy the Cephalopods, 

 which are found together witii the Aiicellae. Thus, we very frequentlj'^ 

 (iud (^.(trdioccras alternaiis, the sj)ecies which has given the Alternans- 

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

 C. Nathorsti, a species nearly related to С alternans and descrihed 

 from deposits on Spitzhergen, which according to Pompeckj^ belong 

 to the Séquanian-Kimmeridgian. Belemnites have also been found 

 in "Kløft I", namely B. Panderiaiuis and B. breviaxis. 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. "Kløft II". Close to the south of "Kløft Г' lies a second 

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

 ner 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 lor any long distance. The sand- 

 stone in "Kløft 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 "Kløft I", were found; for example, 

 Aiicella Bvonni and A. Sinzovi. Further, we have Macrodon Keyser- 

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

 extend in age from the Middle Callovian to the Sé(|uanian. Greater 

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

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

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

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

 fauna list. Thus, in "Kløft И" we have such characteristic forms as 

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

 as P. cfr. validiis. The sandstone in "Kløft II" is possibly a little 

 younger than in "Kløft I", though it still belongs to the Séquanian- 

 Kimmeridgian. 



3. "4. Sænkning". This locahty lies much farther to the 

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

 northernmost of the 3 sandstone regions on the east side of Store 

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



' See A. G. Nathorst: Eine vorläufige Mitteilung von Prof. J. F. Pompeckj über 

 die Altersfrage der Juraablagerungen Spitzbei'gens, p. 1503. — Geol. Foren, i 

 Stockholm Forhandl. Vol. 32. Stockholm 1910. 



