103 



«The grains of augite and those of basalt are plentifully 

 «represented, but those which will now be mentioned are only 

 «sparsely represented: 



^^Plagiodase with large extinction angles. 



« Magnetite ; 



и Brown garnet (?), brown, optically isotropic grains with 

 «strong refraction, and of the same appearance as the dark 

 «garnet in igneous rocks rich in alkalis; 



и Quartz; of this mineral only one single grain was found 

 «in tw^o thin sections. 



«The cement consists chiefly of calcite; but in a few places 

 «pyrite occurs as a cement between the grains of sand. In the 

 «above enumeration have not been included alteration products 

 «of brown and green colour, whose exact nature has not been 

 «determined. 



«This last sample thus consists almost wholly of volcanic 

 «material; it seems to originate from the disintegration of at 

 «least three different rocks: 



«(1) A fresh medium-grained basalt (dolerite) with violet 

 «augite, 



«(2) a very fine-grained and somewhat weathered basalt, 



«(2) a basic igneous rock more rich in alkalis.» 



With regard to the fossils I have only found determinable 

 specimens in the two beds which I have above termed the 

 Coeloma-bed, and the Cyrena-bed. On closer examination it 

 was however proved, that though the state of preservation of 

 the material far exceeded all that had hitherto been brought 

 home from Greenland, yet much was left to be desired. In 

 the best state of preservation were the Crabs occurring in the 

 concretions, and moreover there was an abundance of these. 

 The Mollusca, on the contrary, were almost all found in the 

 very hard sandstone, forming the Cyrena-bed, from which it 



