The marine Carboniferous of North-east Greenl. and its Brachiopod Fauna. 543 



scopical examination, that the limestone contains small angular 

 grains of quartz, and also that the organic formations above-ment- 

 ioned, are preserved in calcite, and that it is easy to determine 

 their shape. Their forms lead us to think more immediately of a 

 connection with algæ. My thin sections show that they possess a 

 perceptible cavity in the middle, and also a fairlj^ thick exterior 

 wall which appears to be undulate interiorly, and thereby appar- 

 ently able to enclose small, divided compartments in the said wall. 

 A closer, expert examination of this peculiar fossil will, prob- 

 ably, be carried out 

 before any very 

 great time has 

 elapsed. 



In addition to 

 the purely phyto- 



palæontological 

 importance of this 

 discovery, it is also 

 of stratigraphical 

 weight, as it points 

 to a shallow water, 

 and to an algal 

 vegetation grow- 

 ing there. 



The whole of 

 the profile that has 



been observed 

 with certainty in 

 the Cape Junger- 

 sen section, con- 



Fig. 9. Slide of the red limestone, containing quartz-grains 



from the Cape Jungersen section, specimen N:o 132. Enlarged 



Sists, thereiore, ot 3 jiarn, xi^js thin section shows some tubes of the "algæ" 



presenting the interior cavity and the undulate structure 



of the wall. 



limestone, and 



there exists no 



evidence showing 



the presence of any interbedding of sandstone in the series. The 

 limestones that have thus been found in situ present no decided 

 resemblances to the rocks in the Mallemukfjæld and at Eskimo 

 Naze, but, in general, are somewhat finer in grain than these, and 

 only some few fragments {N:os 109, 113 and 133), which, in addi- 

 tion, are not known, of a certainty, to have been found in situ, 

 have any connection with the finer-grained rocks from the Malle- 

 mukfjæld. 



On the slope of the hill there have been found several limestone 



41* 



