536 



Karl A. Grönwall. 



tions of Fiisulinœ. Under the microscope the rock agrees fully with 

 N:o 105. 



The next higher level from which there is material available 

 is 35 m. above the sea-level. Here begins a red-gray, highly re- 

 crystallized dolomite {N:o 12A), in Avhich fossils are no longer pre- 

 served. The entire mass is crystalline, with some few holes, probably 

 after fossils. Here and there exist larger crystal-masses which, prob- 

 ably, chiefly represent fragments of crinoids. On treatment with 

 Lemberg's re-agent, the whole mass proved to consist of dolomite. 



From the same 

 level (35 m. above 

 sea-level) there is 

 a specimen {N:o 

 107) of another 

 rock, which has 

 also been highly 

 altered, but in an- 

 other direction. No 

 mention is made, 

 however, of the 

 relative positions 

 of the two rocks. 

 The rock now 

 in question is an 

 almost white or 

 faintly yellowüsh- 

 gray, mottled sili- 

 ceous rock, which 

 does not at all ef- 

 fervesce on treat- 

 ment with hydro- 

 chloric acid, so 

 that the original calcareous constituents have been entirely removed. 

 The rock is porous, however, so that it cannot be called a flint, but 

 probably represents an intermediate stage in the formation of flint 

 or of a siliceous rock. Of larger fossils it contains only some few 

 imprints of larger crinoid stem-joints, which, like other cavities 

 after fossils, can be clothed with secondary quartz-crystals. As above 

 mentioned, the rock-mass is almost white, but it is filled with more 

 or less perfect specimens of foraminifera, chiefly Fusulina, although 

 Bigenerina and rotaliform species are also present. The shells of 

 these foraminifera are preserved in a yellowish-red chalcedon-mass 

 which, to some degree, gives the rock a mottled appearance. Under 



Fig. 5. Slide of the siliceous rock from "the Eastern River' 

 Amdrup's Land. Specimen N:o 107. Enlarged 12 diam. 



