43 



Det vil sees af de ovenanførte Analyser, at Lerets 

 Kalkgehalt er- meget variabel, men kun paa et Par Steder 

 opuaar nogen betydeligere Størrelse. ■ ■ 



De Tal. der lultrykker Lerets Oxydationsgrad, ligger 

 paa faa Undtagelser nær mellem. 1 og 2. Vi kan foreløbig 

 betragte dette som et, med Farven sammenbængende, kemisk 

 Kjendemærke, der kan tjene til at adskille det graa Ler 

 fra de øvrige Sedimenter, hvis Forhold i den samme Ret- 

 ning senere skal belyses. 



Grønligt Ler. 

 i Rhabdamniina-Ler). 



Nordhavets østlige Del. der ligger imellem Norge, 

 liccren Eiland, Spidsbergen og Novaja- Semlja, er af en 

 meget ringe Dybde. En Hævning paa lidt over 400 Meter 

 vikle viere tilstrækkelig for at løfte dets Bund over Havets 

 Overflade og forvandle den til et stort Sletteland. 



De betydelige Stræknmger af denne jevne Havbund. 

 der af Expeditionen blev undersøgte. faiultes bedækkede af 

 et Sediment — Rhabdammina-Ler — . som med Hensyn 

 til Udseende og kemisk Beskafienhed er af en eiendommelig 

 Art. Mest karakteristisk linder vi det paa de østligste Stå- 



lt will be seen from the above analyses that the pro- 

 portion of lime varies- exceedingly in this clay; but its ab- 

 solute amount is not considerable save in one or two 

 localities. 



The figures expressing the degree of oxidation lie. 

 with but few exceptions. between 1 and 2. This we may 

 regard for the jjresent as a chemical feature intimately 

 connected with colour. that serves to distinguish all grey 

 clays from the other deposits whose similarly derived char- 

 acteristics I shall elucidate in turn. 



Green Clays. 



iRhabdammina Clay). 



The eastern section of the North Atlantic, between 

 Norway. Beeren Eiland. Spitzbergen, and Novaja Zemlja. 

 is exceedingly shallow. A rise of but little more than 4i it I 

 metres would suffice to bring the whole of its bed above 

 the surface of the sea aud transform the tract into a vast 

 plateau. 



In the numerous localities of this extensive region, 

 expløred by the Norwegian Expedition. its level floor was 

 found to be covered with a deposit — Rhabdammhia clay 

 — peculiar alike in outward appearance and chemical com- 

 position. Its characteristic features are most salient in the 



