The marine Carboniferous of Nortli-east Greenl. and its Brachiopod Fauna. 555 



Of the rock-t5^es found at the Mallemukfjæld and the Eskimo 

 Naze, the fine-grained Hmestone is richly represented from all three 

 localities, and sometimes it contains greatly silicified fossils which 

 can be developed from the unaltered limestone matrix. Some boulders 

 of the other types have also been found. 



hi addition to the rocks already mentioned, the free-lying finds 

 from the north-eastern part of Amdrup's Land contain some rocks 

 which were not obtained at the other localities, but all are charac- 

 terized by the occurrence of Schwagerina princeps, this fact giving a 

 reliable determination of their level. 



These rocks are, first, a light-gray limestone with a tinge of red, 

 containing a large, rugose coral; the rock is very fine-grained or 

 finely crystalline, and recalls the rock-species (N:os 109, 113, 133) 

 obtained free-lying at 150 metres above sea-level from the Cape 

 Jungersen section; several specimens of this rock were found on 

 Henrik Kröyer's Islets, and one at Sophus Müllers Naze. On the 

 mainland behind Henrik Kröyer's Islets there was obtained an almost 

 dense gray-yellow limestone containing numerous specimens of 

 Schwagerina princeps Moll., and approaching very closely to the rock 

 above mentioned. 



At Sophus Müller's Naze there were found two boulders of 

 limestone {N:os 209, 169), containing Schwagerina, and which, in 

 structure, are in very close agreement with the limestone consisting 

 of rolled calcareous fragments, although each of the boulders presents 

 evident deviations from the general type (see p. 547). 



Like the other rock-types found at the Mallemukfjæld and the 

 Eskimo Naze, the rocks containing Schwagerina have not been 

 obtained from the solid rock, but, still, from the fossil contents, the 

 conclusion can be drawn — as will be shown later on in more 

 detail — that the rocks from the Mallemukfjæld and Eskimo Naze 

 are of about the same age as the Schwagerina horizon in the Car- 

 boniferous of Russia. A closer grouping of the rocks that have 

 been discovered as free-lying, cannot be carried out and as the 

 white limestone with rolled calcareous fragments, so characteristic 

 of the Cape Jungersen section, was also obtained as free-lying mate- 

 rial at many of the localities where such collections were made, it 

 would seem as if we are justified in grouping the whole of the Cape 

 Jungersen section with the finds of free-lying limestones, even if, 

 thereby, the upper marine group probably obtains immensely greater 

 dimensions than the Lower. With the material at our disposal, 

 however, it would be impossible to carry out a classification based 

 on natural grounds. 



